This issue typically occurs if the vCenter Server fails to access the Symantec High Availability Console IP, that was used while configuring single sign-on between the Symantec High Availability Console and the vCenter Server. Since the plugin is disabled the Symantec High Availability tab and dashboard are not available.
Resolution:
Perform the following steps to resolve the issue
While registering the plugin again, specify a Console server IP address that is accessible over the network from the vCenter Server.
"c:\Program Files\Veritas\VRTSsfmh\bin\perl.exe" "c:\Program Files\Veritas\ApplicationHA\bin\create_cert.pl" AppHAConsoleIP=ConsoleIP
The ConsoleIP is the IP address you specified while registering the plugin again.