Install and tune Fail2ban
Ban repeated SSH and application attacks on a VPS without locking out your own office IP.
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Fail2ban watches logs and bans IPs that retry too often. Install it on Ubuntu with apt install fail2ban, enable the SSH jail, and whitelist your office or VPN IP in jail.local.
Start with conservative find-time and ban-time values. Aggressive bans plus a dynamic home IP is a common lock-out.
Fail2ban is your responsibility on a self-managed VPS. Shared hosting already filters abusive traffic at the platform layer.
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