RPC / Over HTTP issue

check your registry for a missing entry for port 6004
HKLM\Software\Microsoft\Rpc\RpcProxy\ValidPorts

you should have an entry for the netbios and fqdn of all your mailbox servers for 6001-6002 and 6004
mail.contoso.com:6001-6002;mail:6001-6002;mail.contoso.com:6004;mail:6004

hi thanks for your reply. I checked the rpc frontend and it does have both ports list for netbios and internal AD domain name (fdqn) but not actual internet email domain name? Should I also include the internet domain name for port 6001-6002 and 6004

SK

Follow this.
http://www.petri.co.il/configure_rpc_over_https_on_a_single_server.htm

no, the front end needs the server name that will resolve to an internal ip address for each back end server

Yes the internal names of backend server is configured in the front end / rpc registry

i would follow the article suggested by @R--R
i believe microsoft also has a kb on setting it up on a single exchange server

once you verify the steps taken you can run
netstat -ano | findstr 600

you should see your ip listening on 6001 6002 and 6004
verify that 6001 is associated with the store.exe process
and that 6002 and 6004 are associated with the mad.exe process

It worked after creating the Reg entry in the GC ..

Bravo... Many Thanks
SK