CODEWITHSUNDEEP
iissingle-sign-oncredentialshttp-status-code-401intermittent
system radmin
system radmin

Reputation: 1

Single SIgn-On IIS Site intermittently responding with 401 errors some mornings on one of two sites

Currently in our testing environment, one IIS site (out of two) intermittently logs 401 authentication errors. This is picked up by monitoring through the following log extract: (shortened)

GET / - 80 - Microsoft+Monitoring+Agent+7.1.10184.0 - 401 2 5 0

When attempting to log into this site during this period, credentials are requested, even though the site is configured for SSO. If this prompt is cancelled (which I assume occurs since credentials are not expected) the 401 - Unauthorized is provided.

Interestingly enough, this issue occurs intermittently - occurred 2 days out of 7 this week.

We currently have a workaround of restarting only the affected site, which then allows users to access via SSO, and we even have an automated task for this.

However I would still like to resolve the root issues itself. Even gaining a greater understanding how a user SSO request can be transformed into needing credentials, and what common causes to this may be. Any help is greatly appreciated!

Edit - iis version is 6.2 Windows server 2012 R2 is also used

Upvotes: 0

Views: 306

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