I have a SharePoint 2016 farm running on 4 Windows 2016 servers (1 web, 1 app, 1 Office Server, 1 SQL).

Approximately once a week, we are experiencing an outage that requires an IIS Reset to resolve. Checking the event logs, it appears that the secure store service is failing. I get a lot of 7557 errors in the application event log:

The Secure Store Service application Secure Store Service is not accessible. The full exception text is: The HTTP service located at http://localhost:32843/SecurityTokenServiceApplication/securitytoken.svc/actas is unavailable

I also see a lot of 8306 events:

An exception occurred when trying to issue security token: An error occurred while receiving the HTTP response to http://localhost:32843/SecurityTokenServiceApplication/securitytoken.svc

After the IIS Reset, the token service url works fine. I'm trying to find the root cause of these errors. I've had a look in the HTTPERR logs. There are a lot of Connection_Dropped and Connection_Dropped_List_full errors around the same time as the outages. However, I don't know where to go from here.

Any suggestions?

1 Answer 1


It may have something to do with the unloading forcibly profiles. I have mainly seen it on the FBA sites. and IIS reset has resolved for me as well. If your case is the same you need to:

You need to change the GP policy: Computer Configuration->Policies ->Administrative Templates->System-> User Profiles 'Do not forcefully unload the user registry at user logoff'

REF: https://social.technet.microsoft.com/Forums/en-US/88b75db9-3046-4d7c-8e30-5f2ec31e86ff/drawbacks-of-enabling-do-not-forcefully-unload-the-user-registry-at-user-logoff-in-group-policy?forum=winserverGP

After applying this you will receive those errors:

Windows cannot unload your registry file. The memory used by the registry has not been freed. This problem is often caused by services running as a user account. Try configuring services to run in either the LocalService or NetworkService account

But at least things are working as expected.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.