Thanks Ivan,

But no, as I said there's no proxy of any sort involved. It's just a
plain Jenkins installation on a VM that's directly connected to the
target network.

--
Stefan

On 28.01.2022 10:33, Ivan Fernandez Calvo wrote:
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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