We are running CRM 2015 Server and Outlook Client. The Outlook client is installed on a Windows 2012 R2 RDS server with Outlook 2013. The CRM client and Outlook are both 32bit installs. If we open a CRM form and dont do anything in it,
it times out after about an hour and prompts for credentials. Even if we enter the correct credentials, the popup comes back instantly as if the credentials are incorrect, but they are not. This was also happening in CRM 2013.

Larry D.