To verify that the login service is functioning properly, choose from one of these options:
Whenever there is a problem with the authentication of any user (either an Extension Mobility user or the application user ID), use the http:\\<server address>\ccmuser page to attempt to log in. If the login attempt fails, Extension Mobility will not work as expected.
Access the http:\\<server address>\LoginService\Tools\sampleloginapp.asp page and enter the appropriate values. The profile ID is the Extension Mobility device profile to log in. The sample login test eliminates any dependencies on the Cisco Customer Response Solutions (CRS) and Customer Response Applications (CRA) server and ensures that the directory service is working.
To resolve this issue, perform these steps:
Check the application user ID and password on the CRA server.
2. Verify that the machine name is valid. If the server has an invalid character in the machine name, like an underscore (_), the logon service
cannot resolve the server name and will not work.
3. The only way to change the name of a Cisco CallManager server is to reinstall the CallManager service due to Structured Query Language (SQL)
For more information on Extension Mobility issues, refer to these documents: