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The "Site is unavailable" error appears during the Unity PCA login
This error can occur due to one of these reasons:
The error can occur when a subscriber browses to http://:/ciscopcaand when Internet connection issues, a PIX Firewall or Secure Sockets Layer (SSL) restrictions are not factors. A possible cause is that the Internet Services Application Programming Interface (ISAPI) redirection filter failed to load.
The Tomcat service is stopped.
The Internet Information Server (IIS) and Tomcat integration are not configured correctly.
To resolve these issues, choose from one of these options: