Website of the secondary server reloads again and again

Website of the secondary server reloads again and again

Hello there,
I just updated our primary pmp server to 7600. After the update I set up a new HA secondary server.
The database HA works good, but as soon as the primary is down and I want to access the website of the secondary server I get a problem.
The login page is displayed normaly but right after the successful login the sides loads again and again.
After a minute the browser crashes. This happens with all browsers I testet (FireFox, Chrome, IE 11).
I already deleted all cookies and restarted both services. 
I can not find any good reasons in a log file...

Did someone got that problem too?

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