I already checked the /etc/apache2/conf.d/ox.conf but the JkMount entries are there:
POST http://x.x.x.x/oxadmin/login?action=login404 (2609ms)
Response: <html>Cannot find class mapping for oxadmin/login</html>
Any advice on how to look further?
JkMount /oxadmin/* ajp13_worker
JkMount /oxadmin ajp13_worker