Browse practical English guides for Windows, networking, DNS, email, Active Directory, virtualization and cloud administration. Open a guide for its checks, command examples and validation steps.
How to activate WordPress debug logs
Save WordPress errors to a log file without showing them to visitors
How to analyze S Channel 36874 and 36888
This guide provides a structured method for analyzing s Channel 36874 and 36888
How to analyze an Event ID 4625
L,Event ID 4625 contains several fields useful for finding the source of,failure d, authentication
How to troubleshoot Outlook Autodiscover
Diagnose Outlook Autodiscover profile setup failures by checking DNS, HTTPS access and the configuration expected by the mail provider.
How to scan a systemd service that does not start
systemctl gives the immediate state of the service while journalctl often explains why the main process has stopped
How to analyze a WordPress redirect loop
The redirect loops often come from, a disagreement between WordPress, proxy, HTTPS and cache
How to analyze a Conditional Access policy
This OOAI guide provides a structured method for analyzing an access policy without multiplying unnecessary changes
How to analyze VSS Event IDs 8193 and 12289
Analyze VSS events 8193 and 12289 using the complete error, HRESULT, writer and provider state, backup-job context and a controlled validation.
How to Increase WordPress PHP Memory
Reasonably add the memory limit available for WordPress when, a memory error l, requires
How to calculate downtime allowed by an SLA
Turn an availability percentage into understandable downtime and verify contractual exclusions.
How to know the DNS servers used on Windows
Identify DNS solvers actually configured on a Windows desktop
How to check a synthetic full backup
A synthetic full primarily stresses the backup repository, so we must distinguish source, chain and target storage
How to correct Sender mismatch with an authenticated SMTP
The name of the user is given in the form of the name of the user
How to create and check a DNS CAA record
Restrict authorized certificate authorities without breaking automated renewals.
How to create an Active Directory user with PowerShell
Create a new AD user properly using the Active 1992ry module….
How to decode a JWT locally without exposing the token
Read a JWT header and payload for troubleshooting while remembering that decoding never validates the signature.
How to deploy DMARC gradually without blocking legitimate emails
A DMARC policy must be gradually deployed to identify all legitimate sources before moving to the quarantine or the mundane
How to disable a WordPress plugin without access to wp-admin
Quickly disable an extension that causes a fatal error when the WordPress administration n, is more accessible
How to troubleshoot AADSTS53003 in Microsoft Entra ID
Identify the exact Conditional Access policy blocking a sign-in without creating a broad exclusion.
How to diagnose cURL 28 in WordPress
This guide provides a structured method for diagnosing the 28 in wordpress
How to diagnose DHCP Snooping
This BOAI guide provides a structured method for diagnosing dhcp snooping without multiplying unnecessary changes
How to diagnose DNSSEC and SERVFAIL
This BOAI guide provides a structured method for diagnosing dnssec and a serfail without multiplying unnecessary changes
How to diagnose Event ID 129 and 153
This guide provides a structured method for diagnostics ID 129 and 153
How to diagnose FSRM file screening
This BOAI guide provides a structured method for diagnosing fsrm and file screen without multiplying unnecessary changes
How to diagnose HTTP 429 and rate limiting
Identify the source of HTTP 429 responses, interpret Retry-After, inspect request rates and correct polling or retry loops within the service policy.
How to diagnose VSS Writers before backup
Before modifying VSS, you must identify precisely which of the following year, and which service or application it belongs to, is not
How to diagnose MySQL error 1213 deadlocks
This BOAI guide provides a structured method for diagnosing mysql 1213-2
How to diagnose OneDrive stuck syncing
Start by identifying the specific file in error before any re-uploading of the client.
How to diagnose Outlook blocked on Loading Profile
A short method allows to distinguish add-in, local profile and Microsoft 365 problem
How to diagnose a noncompliant Intune device
This BOAI guide provides a structured method for diagnosing an intune device that is not compliant without multiplying unnecessary changes
How to diagnose a Proxmox cluster without quorum
This BOAI guide provides a structured method for diagnosing a proxmox cluster without quorum
How to diagnose a docker container that restarts
A restart policy can mask the first application failure; investigate the exit code and logs before restarting or deleting the container.
How to diagnose a vMotion failure
This BOAI guide provides a structured method for diagnosing vmotion failure without multiplying unnecessary changes
How to diagnose a gMSA account
This BOAI guide provides a structured method for diagnosing a gmsa without multiplying unnecessary changes
How to diagnose a Linux filesystem read-only
Reading-only editing can be a protective measure after a storage error or filesystem
How to diagnose inaccessible SMB sharing
An inaccessible SMB sharing can come from DNS, port 445, the sharing name or permissions. These layers must be tested in this order
How to troubleshoot a Kubernetes Pod in CrashLoopBackOff
Identify why a container repeatedly starts and exits without hiding the cause with manual restarts.
How to diagnose a position in 169.254.x.x
This guide allows you to quickly identify why a Windows station does not get a DHCP lease
How to diagnose a systemd timer
This BOAI guide provides a structured method for diagnosing a systemd timer without multiplying unnecessary changes
How to diagnose a connected VPN without access to the LAN
The tunnel can be established while routing, policies or DNS still prevent access to resources
How to diagnose Hyper-V AVHDX differencing disks
This BOAI guide provides a structured method for diagnosing a hyper-v avhdx chain
How to diagnose a WPA3 connection
This BOAI guide provides a structured method for diagnosing a wpa3 connection without multiplying unnecessary changes
How to diagnose an HTTP 504 error
A 504 must be broken down between the proxy network and backend processing time
How to diagnose IPsec Phase 1 error on FortiGate
A Phase 1 error means that IPsec peers fail to properly establish l,IKE before even negotiating the Phase 2 selectors
How to troubleshoot SIP 488 Not Acceptable Here
Compare SDP offers, codecs, and media settings when a trunk or endpoint rejects a call.
How to diagnose a Phase 2 IPsec FortiGate
When Phase 1 is up but traffic does not pass, the selectors and Phase 2 parameters are the first items to compare
How to diagnose an SD-WAN rule
This BOAI guide provides a structured method for diagnosing a sd-wan rule without multiplying unnecessary changes
How to diagnose VMware Changed Block Tracking (CBT)
This BOAI guide provides a structured method for diagnosing vmware cbt without multiplying unnecessary changes
How to diagnose Windows Update error 0x800F0922
This BOAI guide provides a structured method for diagnosing Windows update 0x800f0922
How to size usable RAID capacity
Compare raw capacity, usable capacity, fault tolerance, and smallest-disk impact before purchasing storage.
How to size a switch PoE budget
Add maximum device power draw and retain suitable headroom for startup and expansion.
How to size an immutable backup repository
This BOAI guide provides a structured method for how to dimension an immutable backup without multiplying unnecessary changes
How to ping from a FortiGate
Test the reachability of a destination directly from the FortiGate
How to force GPO update
Force a Windows station to reapply user group and computer strategies
How to format and validate a JSON document
Validate JSON syntax, make it readable, and locate errors before an import or API call.
How to generate a gpresult report for Group Policy
Generate and read gpresult RSoP reports for applied Group Policy, user and computer scope, inheritance and filtering.
How to identify what is consuming Docker disk space
This BOAI guide provides a structured method for identifying what fills docker without multiplying unnecessary changes
How to identify your SMTP server
backover the SMTP server to use to send emails from an application
How to identify a VMware datastore that is filling
Identify the files and VM operations consuming datastore capacity before attempting cleanup.
How to read and verify Prometheus metrics
Verify that a target exposes consistent metrics and that Prometheus collects them successfully.
How to put WordPress in maintenance mode without plugin
Understand the.maintenance file used by WordPress during some updates
How to remove stale Exchange Autodiscover references
This BOAI guide provides a structured method for cleaning an old auto-Catch exchange without multiplying unnecessary changes
How to open Task Manager quickly
Quickly open Task Manager to scan CPU, memory, disk and applications
How to recover WordPress after a plugin critical error
When wp-admin is inaccessible after the, activation or update of,a plugin, the safest way is to disable only the suspicious plugin
How to restart DNS Client service on Windows
Relaunch DNS Client service when required by a specific troubleshooting
How to renew an IP address DHCP under Windows
Force Windows to abandon and then re-demand an IP address to a DHCP server
How to repair an Active Directory secure channel
This BOAI guide provides a structured method for repairing an activeway of security(16) without multiplying unnecessary changes
How to repair Windows with DISM and SFC
Check the Windows component store and repair protected system files with DISM and SFC.
How to repair Windows Update error 0x80073712
This BOAI guide provides a structured method for repairing Windows update 0x80073712
How to repair WinRM and PowerShell Remoting
This BOAI guide provides a structured method for how to repair winrm and powershell remoting without multiplying unnecessary changes.
How to resolve overly long OneDrive paths
This BOAI guide provides a structured method for solving the paths too long a Mount without multiplying unnecessary changes.
How to resolve SMTP 550 5.7.60 Send As errors
This BOAI guide provides a structured method for solving smtp 550 5.7.60 sendl as
How to test IPv6 without breaking IPv4
This BOAI guide provides a structured method for testing ipv6 without breaking ipv4 without multiplying unnecessary changes
How to test DNS resolution of a domain
Check which DNS records are returned for a domain
How to test if a site responds to HTTPS
Check that a web server responds to HTTPS and observe the returned HTTP code
How to test a TCP port with PowerShell
Test-Net-Migration allows you to quickly check if a station can reach a server on a specific TIP port, without installing any additional tool.
How to test a Windows port
Check if a service is responding to a specific port with Power Shell
How to test a scan to SMB folder
The diagnosis must separate network, authentication and SMB compatibility
How to test a SMTP server with OpenSSL
OpenSSL allows you to check the connection to the server, the borough and the certificate presented by a SMTP server before even testing the authentication
How to test a VLAN
A structured approach avoids looking for the way in when the VLAN does not already reach it
How to test EAP-TLS authentication
Troubleshoot certificate-based 802.1X authentication by separating client, RADIUS, PKI, and network causes.
How to test RADIUS authentication
This BOAI guide provides a structured method for testing an authentication XXVI without multiplying unnecessary changes
How to find what fills a Linux drive
It is necessary to distinguish space saturation, saturation in inodes and deleted files still open before cleaning a Linux server
How to find the address Mac of a Windows computer
Identify the physical address of an Ethernet card or Wi-Fi
How to find the source of a Active Directory lock
This method allows you to trace the locked account back to the post, service or equipment using an old password
How to find your IP address on Windows
Quickly display the IPv4 address, gateway and DNS servers used by a Windows workstation
How to find an STP loop on a network
This BOAI guide provides a structured method for finding a loop on a network without multiplying unnecessary changes
How to check the disk space of, Linux server
Quickly display l, use file systems on Linux
How to check the disk space of a Windows server
Quickly display l,space used and available on volumes of a Windows server
How to check the state of an IPsec FortiGate tunnel
Quickly check the state of the IPsec tunnels since the FortiGate LTC
How to check the, state of BitLocker
Check if Windows volumes are encrypted with BitLocker and know their status
How to inspect an HTTPS certificate chain with OpenSSL
Inspect server-sent HTTPS certificates with OpenSSL, read validity dates and SANs, and distinguish a certificate list from hostname and trust verification.
How to check the of expiration of an HTTPS certificate
Check the validity period of the TLS certificate submitted by a site
How to check Active Directory replication
Failure to perform Active Directory can cause inconsistent GPOs, different accounts depending on DCs or errors d, authentication
How to check the route used to a server
Observer the different network jumps borrowed by packages to a destination
How to check MX records of a domain
Identify servers that receive emails from a domain
How to check SPF, DKIM and DMARC records together
The delivability depends on the actual behaviour of the sender and not only the presence of three DNS records.
How to check ports listening on Windows
Identify locally listening ports/UDPs and associated processes
How to check VSS writers when a backup fails
Check VSS writer state and errors near a failed backup, identify the owning application and validate a targeted correction and restore test.
How to check if Windows firewall is enabled
Control the Windows firewall status on Domain, Private and Public profiles
How to check if a PC is attached to a domain
Quickly determine whether a Windows computer is a member of an Active Directory domain
How to verify Active Directory Sites and Services
This BOAI guide provides a structured method for checking active sites and services, without multiplying unnecessary changes
How to check SMB signing
This BOAI guide provides a structured method for checking smbsign without multiplying unnecessary changes
How to check a LACP link aggregation
This BOAI guide provides a structured method for checking a lacp aggregate without multiplying unnecessary changes
How to check an LDAPS certificate on Active Directory
Check the certificate presented by a domain controller, its trust chain, name, and expiration before troubleshooting LDAPS.
How to check a TLS certificate with OpenSSL
OpenSSL can inspect a server certificate, its validity dates, DNS names and the certificate chain sent during the TLS handshake.
How to check a DMARC record
Control the presence and policy of a field
How to check a SPF record
Control the FPS published in the DNS of a mail domain
How to check a DNS AXFR zone transfer
This BOAI guide provides a structured method for checking a zone transfer dns axfr without multiplying unnecessary changes
How to check a 802.1X Wi-Fi configuration
A diagnosis 802.1X must follow the path supposing → point d, access → RADIUS → identity/certificate
How to empty and test DNS cache on Windows
When the DNS has just been modified or a post keeps an old answer, emptying the local cache and comparing resolutions allows to dissipate, separate, and
How to empty DNS cache under Windows
Clear locally stored DNS entries when a site or server points to a wrong address
How to view installed software with PowerShell
Build an inventory of the software declared in Windows uninstall keys….