Release : 12.3
Component : AUTOMIC WEB INTERFACE
When establishing a connection with the Automation Engine, the Automic Web Interface performs additional checks that place entries into the MQWP tables. If you are in a situation where the MQWP tables are overloaded or processing slowly, this could cause a timeout.
As the Java UI does not perform these checks, it is able to complete the connection and sign in; this does not mean that the core issue (MQWP table size) isn't present, just that the checks do not cause a timeout.