I have an odd problem. I had a Sonicwall NSA 250M and everything worked fine. We replaced them with the NSA 2650 firewalls. I have one page where it takes exactly 25 seconds to login and refresh just the one page. After logging in everything works fine.
I rechecked the old firewall rules to make sure I had configured the same way.
Packet capture
There are 2 sites in the DMZ:
Site A and site B are on the same server, 10.0.1.5 and 10.0.1.10. You can connect to site B if you know the full URL and log in through there without any issues. Once you log into Site A you can connect to any other page without any slowdown. All the other pages refresh instantly. It's only the logon page that takes 25 seconds to reload.
I reconnected the old firewall and Sonicwall ran a packet capture, It was no help to them or me.
To summarize: Site A -...