GP 2013 Web Client communication error

I'm able to start GP web client application on the server. When I try to work on a client computer I'm getting an error after Silverlight logging while the application is initializing. The error is

"An error occurred while initializing communication with the server.

Details:

[CrossDomainError]

Arguments: mcc-ts.mcc.com/.../4224

Debugging resource strings are unavailable. Often the key and arguments provide sufficient information to diagnose the problem. See go.microsoft.com/fwlink

Thanks in advance.