On first opening JBoss Central Updates tab, I get a pop-up window with an error message 'An internal error occurred during: "Computing connector status".'

The plug-ins are listed on the JBoss Central Updates tab. I selected install HMT but got a message that the connector is not available.

I tried 'install all' and got a similar error message:
The following connectors are not available: JBoss Tools Maven Packaging Configurator, JBoss Hybrid Mobile Tools + CordovaSim, Eclipse EGit: Mylyn Support, Mylyn Issue Tracker Connectors, Eclipse VJET. Proceed with the installation anyways?

Pressing cancel I get an error message 'Problem Occurred' window.