Does server ssl profile check a web-server certificate validity ?

Hi, I follow your reasoning - it would be logical to assume that if you can access the server directly from your browser, cert should be ok. Yes, that's true from browser's perspective.

I would suggest take a capture on server side and check in Wireshark that you are definitely getting correct certificate back, and that you are definitely getting a certificate back (and that it's not empty for example). Bypassing F5 might seem like a good idea, but it is not a recommended way to troubleshoot these kinds of issues. :)

Thanks,

Alex