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.
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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.
View →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.
View →How 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.
View →How 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.
View →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.
View →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.
View →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 via the file system.
View →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.
View →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.
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