Can you see the url you are getting back from the login? Can the citrix system resolve the appserver/vip the appserver is handing out?
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I had a similar issue and it turned out that one of my app servers did not have this settings enabled where the other one did:
set appserver ValidateClientIpAddress false
set appserver ValidateRequestURL false
I would get the error you are seeing intermittently because one app server had it set correctly and the other one did not. Hope this helps.