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We are facing an error on our server's where the logged in user's are signed out at random, even though sliding expiration is set, with the below error on Event Logs

Event code: 4005
Event message: Forms authentication failed for the request. Reason: The ticket supplied was invalid.

This happens on Windows 2019 Datacenter server, .net 4.5, IIS-10. I have already tried using manually generated machine keys, but it doesn't help

Surya Prakash
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  • did you check what is the time out of your tickets? You can set the timeout and expiration policy (e.g. sliding, absolute) in your web/machine.config under /configuration/system.web/authentication/forms. this is, not an error just information. you could refer this link for more detail:[link1](https://stackoverflow.com/questions/5266578/asp-net-forms-authentication-failed-for-the-request-reason-the-ticket-supplied) ,[link2](https://forums.asp.net/t/1762166.aspx?forms+authentication+failed+for+the+request+reason+the+ticket+supplied+was+invalid) – Jalpa Panchal Oct 16 '19 at 07:01
  • yeah, its a sliding expiration with 15 mins, but the users are being logged out prior to that, and this informational message is logged when that happens. the same timeout works perfectly with the same code on a different server (Win 2012 R2 Standard) – Surya Prakash Oct 17 '19 at 08:50
  • Could you share your form authentication setting and detailed code of the form authentication? did you refer the suggested link? – Jalpa Panchal Oct 17 '19 at 09:30
  • form auth settings is like ` ` the auth code validates the user using the Membership provider, then an auth cookie is set using `FormsAuthentication.SetAuthCookie(username, persistent)` Also, I have checked those links prior, and they weren't helpful – Surya Prakash Oct 17 '19 at 11:19
  • could you share what is your application pool recycling setting? also, you can try comparing the difference between the problem server and that server which works well. – Jalpa Panchal Oct 18 '19 at 08:40

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