In RM HA setup ( e.g. http://rm-1.vip.abc.com:50030/proxy/application_1427789305393_0002/ ), go to the job details and click on the "Cluster tab" on left top side. Click on any of the links , "About", Applications" , "Scheduler". You can see that the hyperlink is pointing to http://am-1.vip.abc.com:port/cluster ).
The port details for secure and unsecure cluster is given below :-
8088 ( DEFAULT_RM_WEBAPP_PORT = 8088 )
8090 ( DEFAULT_RM_WEBAPP_HTTPS_PORT = 8090 )
Ideally, it should have pointed to resourcemanager hostname instead of AM hostname.