I just upgraded to SAM 6.2.0 & NPM 11.5. And all the servers application status state Unknown although the servers up and SNMP polling perfectly. It never happen in the last version.
Hi noriryani,
Have a look at this thread. Though they are discussing about earlier versions of SAM, the information shared there might be useful in your case as well.
Hope this helps.
What if any error is shown when you drill into the application?