Question : rpc over https stopped working

I have had this setup working for 2+ years. As of late night yesterday and today, my users cannot connect via rpc / https. I ran the Exchange connectivity analyzer and here are the results:

ExRCA is testing RPC/HTTP connectivity.
       The RPC/HTTP test failed.
       
      Test Steps
       
      Attempting to resolve the host name mail.na.intercruises.com in DNS.
       Host successfully resolved
       
      Additional Details
      Testing TCP Port 443 on host mail.na.intercruises.com to ensure it is listening and open.
       The port was opened successfully.
      ExRCA is testing the SSL certificate to make sure it's valid.
       The certificate passed all validation requirements.
       
      Test Steps
      The IIS configuration is being checked for client certificate authentication.
       Client certificate authentication wasn't detected.
       
      Additional Details
      Testing Http Authentication Methods for URL https://mail.na.intercruises.com/rpc/rpcproxy.dll
       The HTTP authentication methods are correct.
       
      Additional Details
      SSL mutual authentication with the RPC proxy server is being tested.
       Mutual authentication was verified successfully.
       
      Additional Details
      Attempting to Ping RPC Proxy mail.na.intercruises.com
       RPC Proxy was pinged successfully.
       
      Additional Details
      Attempting to ping RPC Endpoint 6001 (Exchange Information Store) on server intermail.intercruise.local
       Pinged Endpoint successfully
       
      Additional Details
      ExRCA is testing the Name Service Provider Interface (NSPI) on the Exchange Mailbox server.
       Successfully tested NSPI Interface.
       
      Test Steps
      ExRCA is testing the Referral service on the Exchange Mailbox server.
       An error occurred while the Referral service was being tested.
       
      Test Steps
                     
              Attempting to ping RPC Endpoint 6002 (Referral Interface) on server intermail.intercruise.local
       The attempt to ping the endpoint failed.

What is the ExRCA? I've never heard of it.



Any help would be appreciated.

Answer : rpc over https stopped working

Hi
Did you make any changes in the network recently ?
Are 443 80 25 ports - open in firewall and forwarding to exchange server ?

Please check these links for RPC endpoint errors.
http://msexchangeteam.com/archive/2008/06/20/449053.aspx

Ports 6001 6002 6004 -> should be open between Exchange Server and DC.
Please check here in registry if ValidPorts key is set for these ports

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Rpc\RpcProxy

Tests:
a) Can you browse to this location.
https://mail.fqdn.com/rpc/rpcproxy.dll

b) From your exchange server

Start>run>cmd

type

rpccfg.exe /hd


rpcdump /s FQDN.MAILSERVER

More details here
http://support.microsoft.com/kb/908472
http://forums.msexchange.org/m_1800521362/mpage_1/key_/tm.htm#1800521470