The firewall needs to be configured in a way that will allow the Gateway to communicate with the following servers: :
These addresses should be put on a whitelist for all applications.
Double check that there are no application-specific restrictions in place. Oftentimes people are able to ping the servers, but the Gateway still cannot access them. This is because the ‘ping’ application is treated differently by the firewall.
The new version of the Gateway should use default proxy credentials as set in your IE options. Please make sure that the ‘Obtain proxy information from the operating system’ box is checked in Settings->Proxy Settings.