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Xserver's fail2ban blocks SSH after repeated auth attempts, no manual unban available

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Xserver officially confirmed that its fail2ban security mechanism temporarily blocks source IPs that exceed a certain authentication attempt threshold, though the exact parameters are kept confidential. The issue commonly affects WordPress developers whose SSH clients or tools like paramiko try multiple keys per connection, rapidly accumulating failed attempts across parallel sessions. Blocked users experience two escalating symptoms: an initial 'Connection closed' response followed by a full 'Connection refused' if retries continue. Xserver provides no manual unban channel, meaning affected users must either wait roughly half a day to a full day for automatic release or switch to a different source IP to regain immediate access. Minimizing the number of keys offered per connection — by disabling agent forwarding and key discovery in tools like paramiko — can help prevent triggering the block in the first place.

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Xserver's fail2ban blocks SSH after repeated auth attempts, no manual unban available · ShortSingh