Use the following procedure to reach the Personal Assistant Admin page.
Perform a search on your hard drive for the pabootstrap.properties file and, using Notepad or a similar tool, change the entry in the file from LDAPURL=ldap://<Call Manager Name>:8404 to LDAPURL=ldap://<Call Manager IP Add>:8404.
Restart the Personal Assistant server.
Try to use the IP address of the Personal Assistant server while accessing the Admin pages and see if it works.
Make sure that the account running the Personal Assistant Services is part of the local admin group and has the corresponding local admin rights.
If you have installed a new Cisco CallManager server, then you have to rerun the Personal Assistant Setup and point to the new Cisco CallManager server.
If you installed Active Directory plug-in on the Cisco CallManager to point to your Active Directory network, then you need to reinstall Personal Assistant.