If you look on the Performance Advisor/ Setup / Storage System you will the filers that dont show up is red.
What I did was:
On the filer
options httpd.admin.enable on
options httpd.admin.ssl.enable on
Also on the dfm server:
dfm host set <host-name> perfAdvisorTransport=httpsOk
or you can do this in Operations Manager under options / Performance...
Then press F5 in the view that you are missing the filers....
// Roger Bergling