1 - There are big delays for users replies and posts . If I see a thread with 3 replies , when I open it I cant see all replies unless I click ctrl + f5
2 - I can’t log in to administration page
As per attached picture I tried to exclude /forum/* from caching but this is not working at all . The forum is cached no matter what. I have to put it in development mode so I can log to admin
You’re getting closer, but the rules are likely in the wrong order for
what you want – You likely want the /forum* entry to be first.
Once it works, you’ll probably not want to stick with Cache Level set to
Bypass although it is good for testing. Normal caching will probably
work once things are otherwise running.
Also don’t forget to clear the cache after re-order the rules.