The following must be done after a domain change:
1. The domain must be adjusted in the domain column of the dwserver table under dwsystem.
2. If a domain user was used for the services and app pools, this must be adjusted.
3. If a FQDN is used, the URL in the database must be adjusted in the DWSystemSettings for the WebconnectionSettings. In addition, the URL under dwmachine.config (located by default at C:\ProgramData\DocuWare\ServerConfig) must be adjusted.
After the changes, we recommend a MSMQ reset, in the following link is a KBA, which explains how to do a MSMQ reset:
KBA-35787 · DocuWare Support Portal