I have the same problem on one of my instances, but I also have the problem 
that I cannot go back to previous version, because it destroys the other 
instances. I think there is a compatibility issue for plugins, and if you 
could go back, then update all your plugins according to the compatility 
matrix here. 
https://github.com/jenkinsci/jep/blob/master/jep/227/compatibility.adoc
For me, I think I need to try to upgrade the plugins manually...

mÃ¥ndag 22 mars 2021 kl. 16:15:15 UTC+1 skrev [email protected]:

> Hi!  Last week we took 2.277.1 when patching.  I didn't see any issues 
> until this morning when I tried to log on and got 403 No valid crumb was 
> included in the request.  I restarted the server a few times trying to fix 
> it but never could get logged in.  I did some research and found a thread 
> telling me to make a global security setting change to proxy compatibility 
> (even though I'm not proxied), but couldn't get to global security to try 
> that.  So I backed it out to 2.263.4, where we were before.  It's working 
> again, but I'm guessing the same thing will happen next time we apply 
> patches.  Is there a change with 277 that will make me have to change some 
> setting or another?  Thanks!

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