Issue HTTP/2 activation on Plesk stopped server

[Sergey K.]

According to Advisor recommendation, I've activated HTTP/2 - screen - Screenshot
After that all site were down and Plesk access too.

I tried to do according to this article - HTTP/2 Support in Plesk

# plesk bin http2_pref disable

It didn't help me


Any workaround how to disable wrong http2 activation?

 

[Sergey K.]

Updated: Hosting firewall blocked traffic. When Firewall was disabled - all sites operated well.
I read this article how to install HTTP/2 - it looks not so simple :-(
HTTP/2 not working on browsers

Final question:
When protocol HTTP/2 will be activated what rules should be added in FireWall to operate correctly.

 

[Bitpalast]

HTTP/2 cannot affect the firewall and vice versa. There has got to be a different reason for the behavior, e.g. a missing IPv4 exclusion in your Fail2Ban for your server's own IP. Also, activating http/2 will reconfigure the web server, so maybe what you are experiencing is a reconfiguration phase during which the web server has not restarted yet.