The Symantec High Availability tab appears blank except for the following HAD-related error message:

Unable to retrieve the VCS cluster details.
The cluster is either not responding or is not accepting 
the client connection requests.
You may have to unconfigure the cluster and then configure
it again.

The Unconfigure VCS Cluster link also appears in the tab. (2828764)

Workaround: Click the Unconfigure VCS Cluster link, and then proceed with the steps. For more information on this procedure:

See To remove VCS cluster configurations.

You can then freshly configure the VCS cluster and application monitoring to monitor application availability.