This problem occurs when the Performance Center server is unreachable.

1. Verify that the Performance Center server is running and that you can ping to it from the ALM server.
2. Verify that IIS is running on the Performance Center server.
3. Open the IIS manager tool and verify that the IIS Web site hosting the Performance Center virtual directories is running.
4. Verify that the Performance Center application pools ('PCQCWSAppPool' and 'LoadTestAppPool') are running.
5. From the Performance Center server, open Internet Explorer and verify that following URL can be accessed: http://localhost/pcs/LabService.svc?wsdl

A page with details about the web service should open.

If you manage to complete steps 1 to 5 **successfully**:

6. From ALM, open Internet Explorer and enter the above URL. Replace the value localhost twice, once with the fully qualified name of the Performance Center server, and once with the IP address.

7. If the above step works, try to re-add the Performance Center server to ALM. Use the fully qualified name or IP address.

8. If the above step fails, there is probably a problem with the network and/or communication between ALM and Performance Center. Contact your network administrator for assistance.

If you are **unable** to complete steps 1 - 5 successfully:

1. Open the Performance Center server.
2. Stop the IIS on the Performance Center server.
3. Open the cmd box, and enter netstat -ano | findstr :443
4. You will see the service ID number that uses port 443.
5. Select Windows Task Manager > Services tab.
6. Stop the service using the service ID number.
7. Repeat steps 1 to 6, for port used by the IIS's web site hosting the Performance Center server virtual directories (typically port 80).
8. Start IIS and verify that the web site hosting the Performance Center server (typically 'Default Web Site') is running.
9. In Lab Management, **add** the Performance Center server.