Connection could not be established

Hi,

We have several users that frequently cannot login to ASG-RD, no matter what they do an error message pops up that says

Quote:Connection to your current environment could not be established. The product will use now the cached data to run. You can try to establish a connection again by clicking on the "Offline" label in the status bar. Your changes in offline mode will be lost after reconnecting.

http://imgur.com/jGagy9O

Is this a known glitch, how can we resolve it?

Thanks,
-Jake