[Error Code] HTTP/1\.1 500 Internal Server Error [Relevant Links] Contact Google Support [Explanation] 
There may be transient connectivity issues with Google Apps servers. Please check that you are able to connect to http://mail.google.com/a/[domain name]. If you are able to connect without issue, then ensure that the following URLs are available on your network through port 443 - Signing: https://www.google.com/accounts/ClientLogin - Calendar: https://www.google.com/calendar/feeds - Contacts: https://www.google.com/m8/feeds/contacts/ - Email: https://mail.google.com/a/[domain]/r/ - Email Migration: https://apps-apis.google.com/a/feeds/migration/2.0/[domain] If your computer can contact those addresses and you are able to access mail from the web, then please contact Google for Work Support.