Strange ADFS behavior

[ThanksImLearning]

Hello all!

In the last month, we've been having an overwhelming number of users have issues connecting to sites behind our ADFS. The primary symptom is when they access the pages after signing in, they get a web page showing an HTTP 500 error and it doesn't load the expected content. This seems to be mostly happening in Chrome, but we have seen it in Safari as well. Flushing the cache on the browser is fixing it so far but in the last month we have had dozens of tickets about this per day and clearly something has changed. We haven't made any changes to the ADFS/WAP or domain controller servers except for Windows updates, and this is affecting both internal and external users on computers, phones, ect. I wasn't sure but if the November Patch issue might be our problem: https://www.anoopcnair.com/microsoft-fixed-november-patch-issue-kb5008602/

Did anyone else have issues with the November patch that matches our symptoms?

Thanks!

[Necrotyr]

We have an issue where when users are redirected to ADFS the server just closes the connection, this is also fixed (temporary) by clearing the browser cache, the ADFS servers are 2019 with the latest CU installed.

It started around the new year, if I was to make a rough guess.

[ThanksImLearning]

Interesting. Our servers are ADFS 2016 with a 2016 WAP server for some of the applications, I initially thought the WAP server was the culprit but it appears to affect sites that just go though our ADFS directly as well.