Remote Console Plug In Error

Hi,
I am getting the following error message whenever I try to connect to a virtual machine console from vCenter Server. I am unable to access the virtual machine console. How can I avoid this issue? I am looking for an expert’s solution. I have tried to search the best solution but I could not find. Please help me soon. Thanks.

Remote Console Plug-In Error
Cannot access virtual machine console. The request timed out.
The attempt to acquire a valid session ticket for “apt-Proxy” took longer than expected. If this problem persists, contact your system administrator.
