Problem
When configuring groups using BizTalk Server Configuration, an error message is displayed stating, “This server has already joined a group. To reconfigure the server, run the BizTalk Server Configuration Wizard.” The BizTalk Server's workstation name is greater than 15 characters.
Resolution
To resolve, change the workstation name so that it is less than 15 characters and restart the system. Use BizTalk Server Configuration to re-configure everything.