This is even more mysterious now that I've discovered it's only a problem for ME and only when I'm logged in to Chrome. Safari and Edge work, and so does a Chrome private browsing window. Nonetheless, there seems to be a fix on the server side, if I'm correct. After entering credentials on the logon screen (internalsso), I get a "400 Bad Request" error in the browser and I'm seeing these errors in /var/log/httpd/error_log: [Wed Nov 19 14:37:04.988719 2025] [proxy_ajp:error] [pid 2364:tid 2392] AH03229: ajp_msg_append_cvt_string(): BufferOverflowException 4 8159 I found this post on the list https://lists.ovirt.org/archives/list/users@ovirt.org/thread/K4MBGS3ZD4LK6SL... and these in the Red Hat knowledge base (must log in to view) https://access.redhat.com/solutions/1525873 https://access.redhat.com/solutions/732343 (for JBoss 6) https://access.redhat.com/solutions/6166212 (For JBoss 7, which I think oVirt 4.5 uses) The solution is to change a couple of settings in httpd.conf (or in httpd.conf.d): LimitRequestFieldsize 65536 ProxyIOBufferSize 65536 There's a corresponding setting that needs to be changed in JBoss/Wildfly. I think the standalone.xml file referred to in the KB articles is in /usr/share/ovirt-engine-wildfly/standalone/configuration Can someone confirm? Also, is oVirt 4.5 (4.5.7-0.master.20251029141850.git6e58a03353.el9, specifically) using 6 or 7? Running ./jboss-cli.sh from /usr/share/ovirt-engine-wildfly/bin fails with the error Failed to connect to the controller: The controller is not available at localhost:9990: java.net.ConnectException: WFLYPRT0053: Could not connect to remote+http://localhost:9990. The connection failed: WFLYPRT0053: Could not connect to remote+http://localhost:9990. The connection failed: Connection refused Is it listening on another port? I tried ./jboss-cli.sh --version but it wants to be connected