ttech
I am not sure of what you have done as you did not provide all the details of how you swapped servers, so my answer may be "off target".
You appear to be using DOMAIN based login.
Did you move the machine accounts from Win server to SME (not sure if it can easily be done, there may be a Howto),
or otherwise did you join (unjoin & rejoin) the Windows workstation/users to the SME server DOMAIN.
If DOMAIN trust permissions are not setup correctly, you will not be able to access resources.
Have you configured Groups on SME server to allow/control users or groups of users access to ibays etc ?
You do need to look at log files & provide full & exact error messages & log file errors, these are usually critical to help identify the souyrce of problems.
You do need to run those registry tweaks to allow DOMAIN login to work correctly, as advised they are on the SME server, not external, & using the URL provided should access them, otherwise just copy them from the location advised to yoru workstation & run them there.
You need to provide more information.