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Editorial Team
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Asked: 2026-06-06T00:47:53+00:00

Getting 401 errors when trying to use ASP.NET back end in load balanced environment

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Getting 401 errors when trying to use ASP.NET back end in load balanced environment (2 web servers). Windows log says:

Event code: 4005 
Event message: Forms authentication failed for the request. Reason: The ticket supplied was invalid. 
Event time: 6/6/2012 10:34:27 AM 
Event time (UTC): 6/6/2012 5:34:27 PM 
Event ID: de68a535d53e4bdfb11ace24a97c63c9 
Event sequence: 18 
Event occurrence: 7 
Event detail code: 50201

Machine key on both IIS applications configured to be same. What else can cause this problem?

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1 Answer

  1. Editorial Team

    As it turned out two web servers had slightly different set of windows patches installed. As soon as we installed all same patches on both of them – problem was solved.

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