Issue After 3 or 4 page visits, getting an error message.

[DigitalSplendid]

Server operating system version

Ubuntu

Plesk version and microupdate number

18.0.56 #2

After 3 or 4 page visits, getting an error message for [redacted].

 

[Peter Debik]

Almost certainly Fail2Ban: Please check the error_log of the site for "access denied" errors (it's just by my own experience with these cases).

Also check /var/log/fail2ban.log against your own ip address to find the jail that is banning the ip.