Not relevant
Same issue updating from 20.04 to 20.10 ...
Redirecting on this not founded page after succesful login.

Resolved by changing _10-centreon.conf_
Adding that to _
RewriteRule ^index\.html$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.html [L]
ErrorDocument 404 /centreon/index.html
Absolutely not the same problem.
I'm talking about ACL permission issue.
Resolved by changing _10-centreon.conf_
Adding that to __ RewriteRule ^index\.html$ - [L] RewriteCond %{REQUEST_FILENAME} !-f RewriteCond %{REQUEST_FILENAME} !-d RewriteRule . /index.html [L] ErrorDocument 404 /centreon/index.htmlIt's not the same problem as OP refered, but I've got the same issue here, thanks a lot for your help, it worked perfectly ! I was searching for while...
Sorry @BenoitPoulet , I can't help you, I just upgraded my Centreon from 20.04 to 20.10, and I can't reproduce the problem.
Might be a redirect problem ? Maybe the solution is the same kind of the one provided by @adonix-dev ?