IT knowledge hub

Computer error codes

Look for a Windows, SMTP, HTTP, DNS, VPN or backup code, and get its meaning, causes and checks

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0x80004005 — Error not specified

Generic code used when a component does not provide a more precise cause

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0x80042306 — VSS provider veto

A VSS provider refused or blocked snapshot creation.

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0x8004230F — VSS unexpected provider error

VSS received an unexpected error from a snapshot provider.

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0x80042318 — VSS writer not responding

A required VSS writer is not responding correctly.

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0x8004231F — VSS insufficient storage

The storage available for VSS shadow copies is insufficient.

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0x80070002 — File not found

Windows does not find a required file, often during an update, installation or backup

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0x80070003 — Path of access not found

The path to a local resource or network does not exist or is not properly resolved

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0x80070005 — Access denied

Windows or an application does not have the rights to read, write or modify a resource

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0x80070020 — File used by another process

A file or resource is locked by another process at the time of the operation

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0x80070035 — Network path not found

Windows cannot reach a UNC path or an expected SMB resource

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0x80070043 — Network name not found

The server is sometimes reachable but the required share or resource name does not exist

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0x80070070 — Insufficient disk space

Targeted volume n,a enough free space

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0x80070422 — Service disabled

The service required for the operation is disabled or cannot be started

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0x80070424 — Service specified not to exist

Windows does not find the service expected by the operation

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0x8007052E — Failed to open session

The information provided in the identification form shall not be accepted by the system or the resource

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0x800705B4 — Time limit of waiting exceeded

A Windows operation did not complete before the deadline

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0x80070643 — Fatal error during installation

Windows Connor or a d,installation program failed without properly completing the deployment

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0x800706BA — The RPC server is not available

Windows cannot reach the CPR service required for the requested operation

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0x80072EE2 — Time limit of waiting exceeded

An HTTP/HTTPS connection expected by Windows did not respond within the time frame

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0x80072F8F — Check failure of a secure connection

Windows does not properly establish or validate a secure TLS connection

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0x80072F8F — TLS security or date error

A secure connection fails, often due to the clock, certificate or TLS

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0x80073712 — Corrupt Windows components

Files required for Windows Update are missing or damaged

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0x80073712 — Damaged component store

Diagnose Windows error 0x80073712, inspect component-store corruption, and use the correct DISM ScanHealth, RestoreHealth and SFC commands.

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0x8009030C — Logonğ /Doors

SSPI refuses l, authentication with the available information

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0x8009030E — No information of identification available

The security component does not have the information necessary to authenticate the session

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0x80090322 — The main name of the target is incorrect

Kerberos negotiation cannot properly validate the target service, often because of,a PNS or,an inconsistent DNS name

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0x80090322 — Main incorrect target

expected Kerberos identity does not match the targeted service

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0x800B0109 — Chain completed by an unapproved authority

The certificate submitted goes back to a root authority which is not approved by the system

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0x800F081F — Source files could not be found

DISM or Windows Update does not find the files needed to repair or install a Windows component

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0x800F0831 — Missing package or dependency

Windows does not find a package required to complete the installation

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0x800F0906 — Could not download source files

DISM fails to recover the components necessary for repair

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0x800F0922 — Update installation failure

A Windows update could not complete its installation; several causes are possible

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0x800F0922 — Windows Update installation failed

Windows update or functionality cannot be installed

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0x80240034 — Windows Update download failed

Downloading a Windows update is not ending correctly

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0x8024401C — Windows Update timeout

Windows Update client exceeds a delay when communicating with the service

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0x8024402C — Windows Update proxy/DNS error

Windows Update is not able to properly resolve or join its update service

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0xc0000005 — Access violation

An application has tried to, access a closed memory area

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0xC1900101 — Driver-related upgrade failure

A Windows upgrade failed, most commonly because of a driver or hardware device.

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401 — Unauthorized

The resource requires valid authentication

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403 — Forbidden

The server understands the request but refuses access

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404 — Page not found

The requested resource does not exist at the address indicated

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408 — SIP request timeout

The SIP request did not receive a final response within the expected time.

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409 — Conflict

The request is valid but conflicts with the current state of the resource.

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410 — Resource permanently removed

The server indicates that the resource used to exist but is permanently unavailable.

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412 — Precondition failed

A condition sent in the request headers is not satisfied.

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416 — Requested range not satisfiable

The client requested a byte range that does not exist in the resource.

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423 — Resource locked

The resource is locked and cannot currently be modified.

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426 — Protocol upgrade required

The server requires the client to use a different protocol or version.

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480 — Destination temporarily unavailable

The SIP endpoint or service is temporarily unavailable.

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486 — Busy here

The called endpoint reports that it is busy and cannot accept the call.

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487 — SIP request terminated

The SIP transaction was canceled, often after a CANCEL request.

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488 — Media or SIP parameters not acceptable

The destination rejects the offered parameters, often codecs or SDP.

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500 — Internal Server Error

An unexpected error prevents the server from processing the request

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503 — Service Unavailable

The service is temporarily unavailable or overloaded

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503 — SIP service unavailable

The SIP server or trunk is temporarily unable to process the request.

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507 — Insufficient storage

The server lacks enough storage to complete the operation.

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508 — Loop detected

The server detected an infinite loop while processing the request.

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520 — Origin web server returned an unknown error

Cloudflare received an empty, unexpected, or unparseable response from the origin server.

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521 — Origin web server is down

Cloudflare cannot establish a connection to the origin web server.

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522 — Connection to origin timed out

The TCP connection to the origin does not respond within the expected timeout.

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523 — Origin is unreachable

Cloudflare cannot reach the IP address configured for the origin.

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524 — Origin processing timeout

Cloudflare connected successfully but the origin did not return a response quickly enough.

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535 5.7.139 — SMTP AUTH deactivated

Microsoft 365 refuses l, SMTP authentication of the client because SMTP AUTH is disabled to the required level

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535 5.7.3 — SMTP authentication failed

The server refuses the, ID, password or method d, authentication

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550 5.1.1 — Unknown recipient

The server has no name on the recipient's address

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55057.1 — Unauthorised shipment

The SMTP server refuses the message for a reason of authorization, relay or policy

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550 5.7.1 — Sender mismatch

address d, sender is not the authenticated account or is not authorized to send

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554 5.7.1 — Message rejected as spam

The recipient server considers the message or the sender as undesirable

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603 — SIP call declined

The destination explicitly declines the call and indicates no alternate branch should be tried.

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AADSTS50011 — Reply URL mismatch

The redirect URI sent by the application does not match a registered redirect URI.

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AADSTS50076 — Multi-factor authentication required

Microsoft Entra ID requires multi-factor authentication to continue sign-in.

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AADSTS53003 — Access blocked by Conditional Access

The sign-in is blocked by a Conditional Access policy.

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AADSTS700016 — Application not found in tenant

The requested application identifier does not exist or is not available in the target tenant.

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AUTH_FAILED — VPN authentication refused

The VPN server refuses the user, certificate or second factor

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Redirecting loop — ERR_TOO_MANY_rejects

The browser is rerouted to a loop between multiple URLs

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Ceph — HEALTH_ERR

Ceph reports a critical state requiring analysis of OSD, PG, capability or monitors

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Cloudflare 525 — SSL Handshake Failed

The proxy Cloudflare does not manage to properly set up the TLS session with the original server

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Cloudflare 526 —STST SSL-1999

Cloudflare considers the certificate of the server d, which is invalid in strict mode

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cURL 28 — Operation timed out

A URL request did not finish before the set time

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cURL 60 — SSL certificate problem

cURL fails to properly validate the target's TLS certificate

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DFSR Event ID 2213 — Replication interrupted after unexpected stop

DFSR suspended replication of a volume after an unclean shutdown

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DNS Event ID 4004 — DNS integrated with AD

The DNS server was unable to perform a necessary Active Directory operation

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DNS Event ID 4013 — DNS is waiting for Active Directory synchronization

The DNS service integrated with AD waits for initial synchronization before loading certain areas

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DNS NXDOMAIN — Non-existent domain name

The DNS server indicates that the name requested does not exist in the solved area

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SERVFAIL DNS — DNS server failed

The DNS solver was unable to provide a valid response to the request

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White Screen — White Screen of Death

WordPress displays an empty page, usually following a PHP error

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Critical error — A critical error occurred on this site

WordPress encountered a fatal PHP error

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BDD Connection Facility — Error when establishing the connection to the database

WordPress no longer manages to connect to MySQL or MariaDB

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Event ID 1000 — Application

An application or module caused an error in execution

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Event ID 1001 — Windows Error Reporting

Windows Error Reporting recorded a report after a crash or an application incident

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Event ID 10016 — DistributedCOM permission

A COM/DCOM application tried a "Migration" without the expected authorization

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Event ID 1014 — DNS Client timeout

Windows DNS client does not get a response within the time frame

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Event ID 10154 — DNS registration failure

Windows did not manage to dynamically record its DNS records

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Event ID 1030 — Group Policy processing failure

The treatment of group strategies could not be completed correctly

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Event ID 1058 — GPO readout failure

Windows could not read a group strategy from SysVOL or an associated path

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Event ID 11 — Controller error

Identify the device and provider behind Event ID 11, check the storage path, and verify a targeted correction.

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Event ID 1129 — Group Policy failure due to lack of domain connectivity

Windows could not apply strategies because connectivity with a domain controller was not available

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Event ID 12289 — VSS snapshot error

VSS reported an error while creating or managing a snapshot.

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Event ID 129 — Reset to device issued

The storage driver re-opted a device after a timeout

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Event ID 153 — Disk I/O retried

Windows must have retryed an operation d, input/output on a disk

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Event ID 157 — Disk surprise removed

Windows considers that a disk has been removed unexpectedly

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Event ID 1865 — Unable to form the replication topology

Active Directory cannot properly build the necessary replication connections

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Event ID 2019 — Insufficient unpaginated memory

The system no longer has sufficient unpaginated memory to satisfy an allocation

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Event ID 2020 — Insufficient pagina memory

The system has experienced a shortage of resources in the paginated pool

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Event ID 2042 — Too old replication

A domain controller has been out of replication for too long and AD blocks replication to avoid persistent objects

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Event ID 2087 — DNS resolution failure of an AD partner

A domain controller does not properly resolve a replication partner

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Event ID 2103 — Active Directory database restored incompatibly

Active Directory detects a baseline state that can lead to a USN rollback

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Event ID 2212 — DFSRRek

DFSR performs recovery after a volume shutdown or incident

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Event ID 36874 — Schannel handshake failure

S Channel was unable to negotiate a TLS connection correctly

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Event ID 36887 — Schannel fatal alert received

The TLS pair sent a fatal alert to the S Channel component

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Event ID 36888 — Schannel fatal alert

S Channel generated or received a fatal TLS alert

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Event ID 40960 — LSA / secure authentication

LSA reports a negotiation or d problem, authentication with a Service Service

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Event ID 40961 — LSA/87 package

Windows reports a failure d, authentication via a security package

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Event ID 41 — Kernel-Power

Windows restarted without stopping clean detected

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Event ID 4625 — Log-in failed

Windows recorded an attempt d, authentication failed

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Event ID 4740 — Locked user account

Active Directory locked an account after repeated authentication failures

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Event ID 4768 — Request by TGT Kerberos

A domain controller processed an application for Ticket Air Ticket

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Event ID 4769 — Request for Kerberos service ticket

A Kerberos service ticket has been requested for a PNS

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Event ID 4771 — Kerberos pre-authentication failure

Kerberos refused pre-authentication for an account

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Event ID 50 — Delayed Write Failed

Windows could not write cached data on storage

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Event ID 5002 —1990 application pool1999

IIS/WAS disabled a pool after several quick failures

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Event ID 55 — NTFS corruption

NTFS detects a file system inconsistency

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Event ID 5719 — No domain controller available

Netlogon was unable to establish a secure channel with a domain controller

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Event ID 5722 — Invalid machine account password

The secure channel of a computer with the domain is probably unsynchronized

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Event ID 5805 — Session 2008 from Computerdown

A domain controller refuses the trust relationship of a computer account

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Event ID 6008 — Unexpected system shutdown

Windows reports that a previous stop was not performed correctly

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Event ID 7 — Bad block

The system reports a defective block on a storage device

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Event ID 7000 — Service failed to start

Service Control Manager couldn't start a service

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Event ID 7001 — Service dependency failed

A service did not start because an addiction was unavailable

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Event ID 7009 — Service start timeout

A service did not respond quickly enough during its start

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Event ID 7011 — Service control timeout

A service did not respond to an order from the Service Control Manager within the time frame

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Event ID 7031 — Service ended unexpectedly

The Service Control Manager says a service stopped abruptly

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Event ID 8193 — VSS error during an operation

VSS logged an unexpected error during a snapshot or writer operation. Use the full event and HRESULT to identify its impact.

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Event ID 8193 — VSS error

VSS logged an error during a snapshot or writer operation.

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Event ID 98 — NTFS volume requires offline scan

NTFS indicates that offline repair may be required

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HTTP 400 — Bad Request

The server considers the request invalid

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HTTP 401 — An Authorized

The resource requires a valid authentication that has not been, provided or accepted

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HTTP 403 — Forbidden

The server understands the request but refuses access to the resource

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HTTP 405 — Method Not Keyed

The HTTP method used is not allowed for this resource

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HTTP 408 — Timeout

The server expired pending the client's request

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HTTP 413 — PayloadTM Wide

The size of the request body exceeds the accepted limit

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HTTP 415 — A Thousands Media Type

The server refuses the type of content sent

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HTTP 422 — A Processable Content

The request is valid only but fails to validate the business

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HTTP 429 —TM Myces

The client exceeded a limit of requests imposed by the service

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HTTP 431 — Request Header Fields – Large

Query headers exceed a server or proxy limit

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HTTP 502 — Bad Gateway

HTTP 502 Bad Gateway occurs when a gateway or reverse proxy cannot obtain a valid response from an upstream server.

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HTTP 503 — Service A Point

The web server or l,application indicates that the service is temporarily unavailable

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HTTP 504 — Gateway Timeout

HTTP 504 Gateway Timeout occurs when a gateway does not receive a timely response from an upstream server.

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Hyper-V — The chain of virtual hard disks is corrupted

The VHDX or AVHDX chain of a virtual machine n is more coherent

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Hyper-V — Virtual machine failed to start

Hyper-V cannot start a virtual machine

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IKE timeout — Ex IKE negotiation

The Channel is not responding correctly to IPsec negotiation

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Linux — No spaceleft on device

Linux cannot write to the target filesystem because capacity, inodes or a storage quota have been exhausted.

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MySQL 1045 — Access denied for user

MySQL or MariaDB refuses l, authentication of, user

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MySQL 1205 — Lock wait timeout exceeded

One transaction is waiting too long for a lock held by another transaction

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MySQL 1213 — Deadlock found

Transactions are blocking each other and one has to be cancelled

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MySQL 2002 — Can’t connect to local server

The client cannot reach the local MySQL server

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NO_PROPOSAL_CHOSEN — No IP-proposals in the IP sector

The cryptographic parameters of the two IP-ends in the year 1995 do not match

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PHP - Allowed Memory Size Exhausted

Identify why PHP reaches memory_limit, isolate the workload, and verify a bounded fix for the Allowed Memory Size Exhausted error.

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PHP — Maximum execution time exceeded

A PHP script exceeds the maximum duration d, run

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PHP — Too many input variables

PHP ignores some of the fields when max_input_vars is exceeded

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Proxmox — Cluster not ready — no quorum

The Proxmox Cluster no longer has the quorum required for certain operations

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Repository unavailable — Backup repository unavailable

The backup software can no longer join or write in the repository

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SMTP 421 4.4.2 — Stopped SMTP connection

The SMTP server temporarily closes the connection or cannot continue the session

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SMTP 450 4.2.0 — MailboxOceania

The recipient is temporarily unavailable

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SMTP 451 4.4.62 — Microsoft 365 temporary routing error

Exchange Online returns a temporary error related to routing or transfer

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SMTP 451 4.7.500 — Temporary processing error

The server asks to try again later, often because of,a protection or,a temporary limitation

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SMTP 452 4.2.2 — ______________ storage / temporary quota

The server cannot accept the message due to lack of resources or quota

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SMTP 535 5.7.3 — Authentication unsuccessful

SMTP server refuses identifiers or method d, authentication

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SMTP 550 5.1.1 — Recipient address rejected

The recipient address does not exist or is not recognized by the remote mail domain.

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SMTP 550 5.4.1 — 9/ 9: access

The server refuses routing or access to the recipient

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SMTP 550 5.7.26 — Unauthenti(5 ) email

The message is rejected because l, authentication of the sender domain is insufficient according to the policy of the recipient

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SMTP 550 5.7.60 — Send As denied

The authenticated account does not, have the right to, send with the, From address used

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SMTP 550 5.7.64 — Relay / tenant attribution denied

Exchange Online refuses the message because the stream is not correctly assigned or allowed

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SMTP 550 5.7.705 — Tenant exceeded threshold

Understand the Exchange Online tenant sending block and investigate its cause before requesting removal from Microsoft Support.

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SMTP 550 5.7.708 — Traffic not accepted

Exchange Online blocks a stream due to a policy, reputation or protection measure

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SMTP 552 5.2.2 — Exceeded box quota

The recipient's box or storage cannot accept the message anymore

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SMTP 554.57.1 — Rejected message for policy or security

The server has finally refused the message for a security or policy rule

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Snapshot chain invalid — Inconsistent snapshot chain

A virtual disk or backup depends on a missing or invalid parent in the snapshot chain.

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systemd — Start request repeated too quickly

systemd stopped restarting a service after several rapid failures

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VMware — File nd not found

A VM or VMware task refers to a file that is no longer present at the expected location

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VMware —SK disk space on data store

The data store no longer has sufficient space for the requested operation

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VSS 8194 — VSS access error

VSS encountered an error, often related to insufficient permissions or a failure to initialize a VSS writer or snapshot provider.

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VSS_E_WRITERERROR_TIMEOUT — VSS writer timeout

A required VSS writer did not complete its operation within the allowed time.

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WordPress — Error establishing a database connection

WordPress does not manage to connect to its database

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WordPress — The site is experiencing technical difficulties

WordPress detects a fatal error and displays a recovery page