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All Forums >> [Microsoft Exchange 2010] >> Outlook Web Access >> RPC_S_SERVER_UNAVAILABLE error (0x6ba) Page: [1]
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RPC_S_SERVER_UNAVAILABLE error (0x6ba) - 28.Jun.2010 3:54:10 PM   


Posts: 28
Joined: 25.May2010
Status: offline
I have finally figured out most issues and am stuck on one right now. From the exchange connectivity test, everything works except this,

Attempting to ping RPC Endpoint 6001 (Exchange Information Store) on server domain.edu
The attempt to ping the endpoint failed.
Additional Details
RPC_S_SERVER_UNAVAILABLE error (0x6ba) was thrown by the RPC Runtime

There was a link on how to solve it http://technet.microsoft.com/en-us/library/dd439392%28EXCHG.80%29.aspx
I followed all the suggestions, checked and double-checked everything, but it still does not work. I checked telnet to ports 6001, 6002, 6004, and they are fine.

Any advice?
Post #: 1
RE: RPC_S_SERVER_UNAVAILABLE error (0x6ba) - 6.Jul.2010 5:57:27 PM   


Posts: 2335
Joined: 12.Apr.2008
From: The Netherlands
Status: offline

Did you make change to the IP protocols, such as disable IPv6 ?


Best regards,

Johan Veldhuis

Visit my Exchange blog

(in reply to sonu)
Post #: 2
RE: RPC_S_SERVER_UNAVAILABLE error (0x6ba) - 7.Jul.2010 9:55:31 PM   


Posts: 62
Joined: 21.Jun.2010
From: California, US
Status: offline
did you install the rpc over http service in windows server manager under features?


(in reply to jveldh)
Post #: 3
RE: RPC_S_SERVER_UNAVAILABLE error (0x6ba) - 24.Sep.2010 5:52:41 AM   


Posts: 5
Joined: 24.Sep.2010
Status: offline
I'm having the same problem and have been tearing my hair out for 3 days trying to figure it out. Have a Windows Server 2008 as a domain controller and a Windows Server 2003 with Exchange 2007. Installed certificate from a Comodo and works with OWA, no certificate errors.

Any help will be GREATLY appreciated.

(in reply to sonu)
Post #: 4
RE: RPC_S_SERVER_UNAVAILABLE error (0x6ba) - 24.Sep.2010 11:34:04 AM   


Posts: 359
Joined: 16.Sep.2010
Status: offline
Make sure the Microsoft Exchange RPC Client Access service is running on your mailbox server..I ran into this issue on my first test deployment of Exchange 2010 after I built a CAS array, and it turned out to be a firewall blocking port 6001 and 6004 (I believe)

(in reply to addisonk)
Post #: 5
RE: RPC_S_SERVER_UNAVAILABLE error (0x6ba) - 25.Sep.2010 2:16:09 AM   


Posts: 5
Joined: 24.Sep.2010
Status: offline
Thanks. I checked and I see that the Client Access service only applies to to Exchange 2010. Also, I can telnet to ports 6001, 6002 and 6004 from the Exchange box so the firewall is not blocking these ports.

I saw post yesterday that suggests that I may need a UC certificate, as my internal FQDN is different to my external FQDN. The external name is mail.mydomain.co.za and the internal name is exchange.mydomain.co.za. Is it possible that my problem is being caused by the fact that the name on the certificate does not match the internal name of the server?

(in reply to travis.sheldon)
Post #: 6
RE: RPC_S_SERVER_UNAVAILABLE error (0x6ba) - 26.Sep.2010 10:49:13 PM   


Posts: 359
Joined: 16.Sep.2010
Status: offline
I've seen it complain when you use Outlook Anywhere with a warning prompt..but it wouldn't cause it to fail.

What happens when you run

Get-OutlookProvider | fl identity,*principal*

(in reply to addisonk)
Post #: 7
RE: RPC_S_SERVER_UNAVAILABLE error (0x6ba) - 27.Sep.2010 1:43:48 AM   


Posts: 5
Joined: 24.Sep.2010
Status: offline
I now have my doubts that its a certificate problem. I've run numerous tests and all indicate that there is no problem with the certificate.
However, yesterday I discovered that when I ping the Exchange box I get an IPv6 address as a response. Even though I disabled IPv6 on the box and added the necesary registry key. I tried to uninstall IPv6 completely via remote desktop yesterday but then lost the connection so I am going to the site this morning to finish it. What do you think of this?

(in reply to travis.sheldon)
Post #: 8

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