It looks like a reverse proxy wrong redirection rules to me (I hit it in 
the past), you can check with `curl` the redirections and who make them, 
something like

curl -Lv -u user:${PASSWORD} ${JENKINS_URL}/iconSize?16x16

El jueves, 27 de enero de 2022 a las 16:17:49 UTC+1, Stefan Möbius escribió:

> Hi,
>
> One of our Jenkins deployments recently started acting up. When you
> access it, you get prompted for your credentials (no surprise there), it
> apparently accepts them, but then fails to load any further page.
> Looking at a network trace shows, that requests to /iconSize?16x16 and
> /j_spring_security_check are answered with a redirect to /
>
> Anybody able to suggest what’s wrong?
>
> Yes, I am aware of the various questions to similar issues, but I’m not
> using OpenID, nor a proxy.
>
> Jenkins security is configured to Active Directory, which appears to
> work. The setting “Require TLS” doesn’t make a difference.
>
> This is Jenkins 2.319.2. All installed plugins are up-to-date.
>
> I’ve tried to play around with extended logging, but since I don’t know
> what I’m looking for, I’ve had little luck.
>
> What could I look for?
>
> Regards,
> Stefan
>

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