ASP NET Forms Authentication failed for the request Reason The ticket supplied has expired

Question

I am getting this error many times in the event log and users are logged out       Event code  4005   Event message  Forms authentication failed for the request  Reason  The ticket  supplied has expired    Event time  3 10 2011 3 35 22 PM   Event time  UTC   3 10 2011 8 35 22 PM   Event ID  fc2f70cc85014b0ca7dbb01471617b66   Event sequence  3392   Event occurrence  1   Event detail code  50202   Thoughts    I am not using web forms   I do not think the app pool is recycling   I compared the Process ID in several events and it is equal   My machine key is not AutoGenerate

User · Answer

I ve had the same issue after using a web config from another machine  The problem was related with an invalid MachineKey  To solve the problem  I modified the web config to use the correct MachineKey of my server   This MSDN blog post shows how to generate a MachineKey

User · Answer

AS Scott mentioned here http   weblogs asp net scottgu archive 2010 09 30 asp-net-security-fix-now-on-windows-update aspx After windows installed security update for  net framework  you will meet this problem   just modify the  configuration section in your web config file and switch to a different cookie name

User · Answer

I was getting this same error  in our case it was caused by a load balancer  We hade to make sure that the persistance was set to Source IP   Otherwise the login form was opened by one server  and processed by the other  which would fail to set the authentication cookie correctly   Maybe this helps someone else

User · Answer

Sounds like an error you would get when your forms authentication ticket has expired   What is the timeout period for your ticket   Is it set to sliding or absolute expiration     I believe the default for the timeout is 20 minutes with sliding expiration so if a user gets authenticated and at some point doesn t hit your site for 20 minutes their ticket would be expired   If it is set to absolute expiration it will expire X number of minutes after it was issued where X is your timeout setting   You can set the timeout and expiration policy  e g  sliding  absolute  in your web machine config under  configuration system web authentication forms

User · Answer

Here is a good article from Microsoft http   www iis net learn troubleshoot security-issues troubleshooting-forms-authentication that covers various cases and scenarios

[asp.net] ASP.NET Forms Authentication failed for the request. Reason: The ticket supplied has expired

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