PR_END_OF_FILE_ERROR in Firefox may be caused by fail2ban

If you experience a PR_END_OF_FILE_ERROR in firefox, I experienced that it might be caused by a fail2ban block for the given user IP on SSL / https pages.

Just as a note to myself if I should ever run into that problem again.

Further information can be found here for example:
https://support.mozilla.org/en-US/questions/1267074
https://superuser.com/questions/1492755/what-does-the-pr-end-of-file-err...

No local fixes needed in my case - just check if the IP is in the blocked IPs table and remove it, if unwanted.

By the way: In Plesk the WAF (Web Application Firewall) may lead to this block, even if set to "Detection only"!
The log entires are scanned by fail2ban and may lead to jail entires!

Einordnung:

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