/logon/logonServlet stopped

Not sure the reason, when accessing https://<host>:58401/logon/logonServlet I get a 503 service unavailable / application stopped error. I'm unable to find identify the application to start it.

I can however access https://<host>:58401/irj/portal and am presented with a login page and can authenticate.

Can someone help me start the /logon/logonServlet application?

Thx,

Greg