A 404 error when you gain access to WebLM from the browser.

A Connection refused error when you communicate with WebLM server using the client API.

If the JBoss service fails to run.

If you use an incorrect URL to gain access to WebLM.

If you have network connectivity issues while gaining access to WebLM from a remote computer.

If the configuration of HTTPS in the standalone.xml file of JBoss is incorrect.

If several applications run on the server that hosts JBoss, and the server caters to a large number of simultaneous requests.