The URL for the Admin app link in the database can be corrected with the following steps:
- Open SQL Mgmt studio.
- Expand Databases > CTData > Tables
- Select to Edit the AppLinks table.
- The Admin app will be in row 1 with id=1.
- Change the url entry on this row to use the correct hostname (e.g. cam.example.com:443 instead of oldcam.example.com:443).
- Save and start a new CAM browser session.
After these changes are made you should see the link to the Admin application again.