By default Web screen install assigns Local system to Sage.CNA.WindowsService, In a two server setup a custom user account is required.
Sage.CNA.WindowsService which handles web screen printer functions, requires logon as account to be assigned as a Windows service account. By default Web Screens us Local System account, this account does not have rights to connect to shared data location.
Windows service account should be a member of the Web Server Local administrators.