Openshift cluster console is unaccessible even when the console pods are running

Issue

• Openshift web console is accessible but cluster console is showing the following error:

Unable to connect
  Browser can’t establish a connection to the server at console.abcd.example.com.
- The site could be temporarily unavailable or too busy. Try again in a few moments.
- If you are unable to load any pages, check your computer’s network connection.
- If your computer or network is protected by a firewall or proxy, make sure that browser is permitted to access the Web.