Symptoms
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On a Plesk for Linux server, all websites/webmails show error 502 every hour or even constantly.
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Apache restarts repeatedly for a while:
# journalctl -u httpd | grep “Stopping|Starting”
plesk.example.com systemd[1]: Stopping The Apache HTTP Server…
plesk.example.com systemd[1]: Starting The Apache HTTP Server…
plesk.example.com systemd[1]: Stopping The Apache HTTP Server…
plesk.example.com systemd[1]: Starting The Apache HTTP Server…
plesk.example.com systemd[1]: Stopping The Apache HTTP Server…
plesk.example.com systemd[1]: Starting The Apache HTTP Server…
… -
SSL It! extension was updated to version 1.8.4-1208.
Cause
Product issue:
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#EXTSSLIT-1645 "The extension no longer reassigns an already issued Let’s Encrypt certificate to a domain every hour if its mail component should not be secured."
Fixed in:- SSL It! 1.8.5 12 June 2021
Resolution
Please consider updating your server:
with