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If Proxmox VE 9 shows “The current guest configuration does not support taking new snapshots” on an LVM thick-backed VM, the usual cause is not ... (Read more)

If SSH or SFTP logins started failing right after an OpenSSH 10 upgrade, the usual cause is not your firewall, your users, or the SFTP subsystem. It is key exchange. OpenSSH 10 disables old finite-field Diffie-Hellman key exchange methods in sshd by default, so ... (Read more)

If Rspamd Bayes is not learning on your DirectAdmin server, the usual cause is simple: Bayes has not seen enough clean mail and spam yet, or you never wired DirectAdmin and Dovecot to feed training data into Rspamd in the first place. The giveaway is a log line like: “The ha... (Read more)

A WordPress 502 Bad Gateway error means NGINX received the request, forwarded it to PHP-FPM for processing, and got no valid response back. The fix is almost always one of seven things: PHP-FPM is stopped, the socket path is mismatched, the FPM worker pool is exhausted, NGI... (Read more)

If you are managing email for a small business or a hosting client, you have likely encountered the dreaded "SPF PermError: too many DNS lookups" rejection. This error does not mean your server is compromised or that your domain is blacklisted. It means your SPF (Sender Poli... (Read more)

A kernel panic is a fatal system error from which the Linux kernel cannot safely recover. When this happens, the operating system stops all execution to prevent data corruption. The only way to find the real cause of a kernel panic is to read the core dump generated at the e... (Read more)