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Issue Bad Gateway - nginx - IPv6 only

Powie

Regular Pleskian
Server operating system version
U22
Plesk version and microupdate number
Latest
Only on one Server, we are facing the issue that No Sites are reachable by IPv6. Theres the upstream Error in the logs. No Idea why..

We tried the plesk repair tool and also checked fail2ban but got No Idea.
IT works on Pages with nginx only settings, but Not for default Setups with nginx/Apache .

Any recommendations what to Check next?
 
Try to add these rules to the Nginx domain options:

proxy_buffer_size 128k;
proxy_buffers 4 256k;
proxy_busy_buffers_size 256k;
 
Try to add these rules to the Nginx domain options:

proxy_buffer_size 128k;
proxy_buffers 4 256k;
proxy_busy_buffers_size 256k;
doesn't help... also exist on docker port forwards by ipv6. investigating more n ngnx config now
 
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