How to
Short, practical guides to complete an IT task without wasting time.
How to activate WordPress debug logs
Save WordPress errors to a log file without showing them to visitors.
Voir le guide → Microsoft 365 & CloudHow to analyze a policy Conditional Access
This BAOI guide provides a structured method for analyzing an access policy without multiplying unnecessary changes.
Voir le guide → WordPressHow to analyze a WordPress redirect loop
The redirect loops often come from a disagreement between WordPress, proxy, HTTPS and cache.
Voir le guide → Microsoft 365 & CloudHow to analyze an Auto-Divd problem
Auto SQL is often at the heart of Outlook or d profile creation problems, old Exchange environments.
Voir le guide → CybersecurityHow to analyze an Event ID 4625
L,Event ID 4625 contains several fields useful for finding the source of,failure of authentication.
Voir le guide → CybersecurityHow to analyze S Channel 36874 and 36888
This guide provides a structured method for analyzing s Channel 36874 and 36888.
Voir le guide → Backup & PRAHow to analyze VSS 813 and 12289
This BAOI guide provides a structured method for analyzing vss 813 and 12289.
Voir le guide → GuideHow to calculate downtime allowed by an SLA
Turn an availability percentage into understandable downtime and verify contractual exclusions.
Voir le guide → CybersecurityHow to check a 802.1X Wi-Fi configuration
A diagnosis 802.1X must follow the path supposing → point of access → RADIUS → identity/certificate.
Voir le guide → DNS & EmailHow to check a DMARC record
Control the presence and policy of a field.
Voir le guide → DNS & EmailHow to check a DNS AXFR zone transfer
This BAOI guide provides a structured method for checking a zone transfer dns axfr without multiplying unnecessary changes.
Voir le guide → Storage, NAS & SANHow to check a LACP aggregate
This BAOI guide provides a structured method for checking a lacp aggregate without multiplying unnecessary changes.
Voir le guide → DNS & EmailHow to check a SPF record
Control the FPS published in the DNS of a mail domain.
Voir le guide → Backup & PRAHow to check a synthetic full backup
A synthetic full primarily stresses the backup repository, so we must distinguish source, chain and target storage.
Voir le guide → CybersecurityHow to check a TLS certificate with OpenSSL
OpenSSL allows you to quickly control TLS certificate, string and trading from a command line.
Voir le guide → Windows Server & Active DirectoryHow to check Active Directory replication
Failure to perform Active Directory can cause inconsistent GPOs, different accounts depending on DCs or errors of authentication.
Voir le guide → Windows Server & Active DirectoryHow to check Active Directory Sites and Services
This BAOI guide provides a structured method for checking active sites and services, without multiplying unnecessary changes.
Voir le guide → GuideHow 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.
Voir le guide → Windows Server & Active DirectoryHow to check if a PC is attached to a domain
Quickly determine whether a Windows computer is a member of an Active Directory domain….
Voir le guide → CybersecurityHow to check if Windows firewall is enabled
Control the Windows firewall status on Domain, Private and Public profiles.
Voir le guide → LinuxHow to check the disk space of, Linux server
Quickly display the use file systems on Linux.
Voir le guide → DNS & EmailHow to check MX records of a domain
Identify servers that receive emails from a domain.
Voir le guide → Networking & Wi‑FiHow to check ports listening on Windows
Identify locally listening ports/UDPs and associated processes.
Voir le guide → Windows Server & Active DirectoryHow to check SMB Signing
This BAOI guide provides a structured method for checking smbsign without multiplying unnecessary changes.
Voir le guide → DNS & EmailHow 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.
Voir le guide → CybersecurityHow to check the of expiration of an HTTPS certificate
Check the validity period of the TLS certificate submitted by a site.
Voir le guide → Windows Server & Active DirectoryHow to check the disk space of a Windows server
Quickly display the space used and available on volumes of a Windows server…
Voir le guide → Networking & Wi‑FiHow to check the route used to a server
Observer the different network jumps borrowed by packages to a destination…
Voir le guide → FortiGate & VPNHow to check the state of an IPsec FortiGate tunnel
Quickly check the state of the IPsec tunnels since the FortiGate LTC….
Voir le guide → CybersecurityHow to check the string of an HTTPS certificate with OpenSSL
s_client allows to see the certificate actually presented by a server and the intermediate certificates sent to the client.
Voir le guide → CybersecurityHow to check the, state of BitLocker
Check if Windows volumes are encrypted with BitLocker and know their status.
Voir le guide → Backup & PRAHow to check VSSKyr backups
Control the Windows VSS Writers status when a backup using VSS fails….
Voir le guide → Microsoft 365 & CloudHow to clean an old Auto SQL Exchange
This BAOI guide provides a structured method for cleaning an old auto-Catch exchange without multiplying unnecessary changes.
Voir le guide → DNS & EmailHow to correct Sender mismatch with an authenticated SMTP
The name of the user is given in the form of the name of the user.
Voir le guide → Windows Server & Active DirectoryHow to create an Active Directory user with PowerShell
Create a new AD user properly using the Active 1992ry module….
Voir le guide → GuideHow to create and check a DNS CAA record
Restrict authorized certificate authorities without breaking automated renewals.
Voir le guide → GuideHow 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.
Voir le guide → DNS & EmailHow 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.
Voir le guide → FortiGate & VPNHow 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.
Voir le guide → LinuxHow to diagnose a docker container that restarts
The first error of application is often masked by aggressive ROUND policy.
Voir le guide → Windows Server & Active DirectoryHow to diagnose a gMSA
This BAOI guide provides a structured method for diagnosing a gmsa without multiplying unnecessary changes.
Voir le guide → LinuxHow to diagnose a Linux filesystem read-only
Reading-only editing can be a protective measure after a storage error or filesystem.
Voir le guide → FortiGate & VPNHow 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.
Voir le guide → Networking & Wi‑FiHow 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.
Voir le guide → VirtualisationHow to diagnose a Proxmox cluster without quorum
This BAOI guide provides a structured method for diagnosing a proxmox cluster without quorum.
Voir le guide → LinuxHow to diagnose a systemd timer
This BAOI guide provides a structured method for diagnosing a systemd timer without multiplying unnecessary changes.
Voir le guide → Storage, NAS & SANHow to diagnose a WPA3 connection
This BAOI guide provides a structured method for diagnosing a wpa3 connection without multiplying unnecessary changes.
Voir le guide → VirtualisationHow to diagnose an AVHDX Hyper-V
This BAOI guide provides a structured method for diagnosing a hyper-v avhdx chain.
Voir le guide → Storage, NAS & SANHow to diagnose an HTTP 504 error
A 504 must be broken down between the proxy network and backend processing time.
Voir le guide → Microsoft 365 & CloudHow to diagnose an Intune device that does not conform
This BAOI guide provides a structured method for diagnosing an intune device that is not compliant without multiplying unnecessary changes.
Voir le guide → WordPressHow to diagnose cURL 28 in WordPress
This guide provides a structured method for diagnosing the 28 in wordpress.
Voir le guide → Networking & Wi‑FiHow to diagnose DHCP Snooping
This BAOI guide provides a structured method for diagnosing dhcp snooping without multiplying unnecessary changes.
Voir le guide → Storage, NAS & SANHow to diagnose DNSSEC and a SERVFAIL
This BAOI guide provides a structured method for diagnosing dnssec and a serfail without multiplying unnecessary changes.
Voir le guide → Storage, NAS & SANHow to diagnose Event ID 129 and 153
This guide provides a structured method for diagnostics ID 129 and 153.
Voir le guide → Windows Server & Active DirectoryHow to diagnose FSRM and File Screening
This BAOI guide provides a structured method for diagnosing fsrm and file screen without multiplying unnecessary changes.
Voir le guide → Storage, NAS & SANHow to diagnose HTTP 429 and the limiting spleen
This guide provides a structured method for diagnosing http 429 and the limiting spleen without multiplying unnecessary changes.
Voir le guide → Windows Server & Active DirectoryHow 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.
Voir le guide → FortiGate & VPNHow to diagnose IPsec Phase 1 error on FortiGate
A Phase 1 error means that IPsec peers fail to properly establish the IKE before even negotiating the Phase 2 selectors.
Voir le guide → Bases de data & SQLHow to diagnose MySQL 1213 Paullock
This BAOI guide provides a structured method for diagnosing mysql 1213-2.
Voir le guide → Microsoft 365 & CloudHow to diagnose OneDrive stuck syncing
Start by identifying the specific file in error before any re-uploading of the client.
Voir le guide → Microsoft 365 & CloudHow to diagnose Outlook blocked on Loading Profile
A short method allows to distinguish add-in, local profile and Microsoft 365 problem.
Voir le guide → Storage, NAS & SANHow to diagnose SD-WAN rule
This BAOI guide provides a structured method for diagnosing a sd-wan rule without multiplying unnecessary changes.
Voir le guide → VirtualisationHow to diagnose vMotion failure
This BAOI guide provides a structured method for diagnosing vmotion failure without multiplying unnecessary changes.
Voir le guide → VirtualisationHow to diagnose VMware C BT
This BAOI guide provides a structured method for diagnosing vmware cbt without multiplying unnecessary changes.
Voir le guide → Backup & PRAHow 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.
Voir le guide → Windows & Poste clientHow to diagnose Windows Update 0x800F0922
This BAOI guide provides a structured method for diagnosing Windows update 0x800f0922.
Voir le guide → Backup & PRAHow to dimension an immutable backup
This BAOI guide provides a structured method for how to dimension an immutable backup without multiplying unnecessary changes.
Voir le guide → WordPressHow to disable a WordPress plugin without access to wp-admin
Quickly disable an extension that causes a fatal error when the WordPress administration is not more accessible.
Voir le guide → DNS & EmailHow 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 quickly to isolate the problem.
Voir le guide → DNS & EmailHow to empty DNS cache under Windows
Clear locally stored DNS entries when a site or server points to a wrong address….
Voir le guide → Networking & Wi‑FiHow to find a STP loop on a network
This BAOI guide provides a structured method for finding a loop on a network without multiplying unnecessary changes.
Voir le guide → Networking & Wi‑FiHow to find the address Mac of a Windows computer
Identify the physical address of an Ethernet card or Wi-Fi….
Voir le guide → Windows Server & Active DirectoryHow 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.
Voir le guide → LinuxHow 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.
Voir le guide → Networking & Wi‑FiHow to find your IP address on Windows
Quickly display the IPv4 address, gateway and DNS servers used by a Windows workstation…
Voir le guide → Windows Server & Active DirectoryHow to force GPO update
Force a Windows station to reapply user group and computer strategies….
Voir le guide → GuideHow to format and validate a JSON document
Validate JSON syntax, make it readable, and locate errors before an import or API call.
Voir le guide → Windows Server & Active DirectoryHow to generate a Gp Report for a GPO in the year 2002
gp 2002 shows which GPOs are applied, refused or filtered for a position and user.
Voir le guide → VirtualisationHow to identify a VMware datastore that is filling
The growth of a data store must be attributed to VM,Producers, ISO or temporary files before cleaning.
Voir le guide → LinuxHow to identify what fills Docker
This BAOI guide provides a structured method for identifying what fills docker without multiplying unnecessary changes.
Voir le guide → DNS & EmailHow to identify your SMTP server
backover the SMTP server to use to send emails from an application.
Voir le guide → WordPressHow to Increase WordPress PHP Memory
Reasonably add the memory limit available for WordPress when, a memory error the requires.
Voir le guide → DNS & EmailHow to know the DNS servers used on Windows
Identify DNS solvers actually configured on a Windows desktop.
Voir le guide → Windows & Poste clientHow to open Task Manager quickly
Quickly open Task Manager to scan CPU, memory, disk and applications.
Voir le guide → FortiGate & VPNHow to ping from a FortiGate
Test the reachability of a destination directly from the FortiGate….
Voir le guide → WordPressHow to put WordPress in maintenance mode without plugin
Understand the.maintenance file used by WordPress during some updates.
Voir le guide → GuideHow to read and verify Prometheus metrics
Verify that a target exposes consistent metrics and that Prometheus collects them successfully.
Voir le guide → WordPressHow 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 via the file system.
Voir le guide → Networking & Wi‑FiHow to renew an IP address DHCP under Windows
Force Windows to abandon and then re-demand an IP address to a DHCP server.
Voir le guide → Windows Server & Active DirectoryHow to Repair a Secure Active Directory Channel
This BAOI guide provides a structured method for repairing an activeway of security(16) without multiplying unnecessary changes.
Voir le guide → Windows & Poste clientHow to Repair Windows Update 0x80073712
This BAOI guide provides a structured method for repairing Windows update 0x80073712.
Voir le guide → Windows & Poste clientHow to repair Windows with DISM and SFC
Control and repair Windows components and then system files protected.
Voir le guide → Windows Server & Active DirectoryHow to repair WinRM and PowerShell Remoting
This BAOI guide provides a structured method for how to repair winrm and powershell remoting without multiplying unnecessary changes.
Voir le guide → Microsoft 365 & CloudHow to resolve overly long OneDrive paths
This BAOI guide provides a structured method for solving the paths too long a Mount without multiplying unnecessary changes.
Voir le guide → DNS & EmailHow to restart DNS Client service on Windows
Relaunch DNS Client service when required by a specific troubleshooting.
Voir le guide → LinuxHow 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.
Voir le guide → GuideHow to size a switch PoE budget
Add maximum device power draw and retain suitable headroom for startup and expansion.
Voir le guide → GuideHow to size usable RAID capacity
Compare raw capacity, usable capacity, fault tolerance, and smallest-disk impact before purchasing storage.
Voir le guide → Microsoft 365 & CloudHow to solve SMTP 550 5.7.60 Send As
This BAOI guide provides a structured method for solving smtp 550 5.7.60 sendl as.
Voir le guide → Imprimantes & ScanHow to test a scan to SMB folder
The diagnosis must separate network, authentication and SMB compatibility.
Voir le guide → DNS & EmailHow 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.
Voir le guide → Networking & Wi‑FiHow to test a TCP port with PowerShell
Test-NetConnection allows you to quickly check if a station can reach a server on a specific TCP port, without installing any additional tool.
Voir le guide → Networking & Wi‑FiHow to test a VLAN
A structured approach avoids looking for the way in when the VLAN does not already reach it.
Voir le guide → Networking & Wi‑FiHow to test a Windows port
Check if a service is responding to a specific port with Power Shell.
Voir le guide → DNS & EmailHow to test DNS resolution of a domain
Check which DNS records are returned for a domain….
Voir le guide → GuideHow to test EAP-TLS authentication
Troubleshoot certificate-based 802.1X authentication by separating client, RADIUS, PKI, and network causes.
Voir le guide → CybersecurityHow to test if a site responds to HTTPS
Check that a web server responds to HTTPS and observe the returned HTTP code.
Voir le guide → Storage, NAS & SANHow to test IPv6 without breaking IPv4
This BAOI guide provides a structured method for testing ipv6 without breaking ipv4 without multiplying unnecessary changes.
Voir le guide → Storage, NAS & SANHow to test RADIUS authentication
This BAOI guide provides a structured method for testing an authentication XXVI without multiplying unnecessary changes.
Voir le guide → GuideHow to troubleshoot a Kubernetes Pod in CrashLoopBackOff
Identify why a container repeatedly starts and exits without hiding the cause with manual restarts.
Voir le guide → GuideHow to troubleshoot AADSTS53003 in Microsoft Entra ID
Identify the exact Conditional Access policy blocking a sign-in without creating a broad exclusion.
Voir le guide → GuideHow to troubleshoot SIP 488 Not Acceptable Here
Compare SDP offers, codecs, and media settings when a trunk or endpoint rejects a call.
Voir le guide → Windows & Poste clientHow to view installed software with PowerShell
Build an inventory of the software declared in Windows uninstall keys….
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