The RPC server is unavailable. 0x800706ba (WIN32: 1722 RPC_S_SERVER_UNAVAILABLE) - From DC to CA

xexon-0199 25 Reputation points

Hi, I got the following error The RPC server is unavailable. 0x800706ba (WIN32: 1722 RPC_S_SERVER_UNAVAILABLE) when I try enroll a certificate from Domain Controller to CA Server.

I was reading posts like: [](

But nothing working for me now.


-Ping from DC to CA Server its Working and ping from CA Server to DC.

-Firewalls its turn off in both sides.

-RPC service its working and running in the DC.

From DC to CA:


Looking for the event views i found this that its the main reason about the problem


Also, I added the group "Domain Controllers" to the local group "Certificate Service DCOM Access" I saw in this post

If I enroll a cert from an other machine its working correctly. (Windows 10 machine cert enroll to CA Server working correctly)


Best Regards, I hope I can fix this error because I dont know whats happens.

Active Directory
Active Directory
A set of directory-based technologies included in Windows Server.
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  1. Thameur-BOURBITA 32,496 Reputation points

    Hi @Anonymous

    It seems that the RPC port 135 TCP and dynamic ports required for certificate enrollement are not opened between domain controller where you have the RPC error and PKI.

    You can use the following tools to check the statut of RPC port:

    PortQryUI - User Interface for the PortQry Command Line Port Scanner

    Please don't forget to mark helpful answer as accepted