repadmin /syncall RPC Server is unavailable – ipv6 problem


Recently I was cleaning up our DNS system after adding new NICs to the server and during this process I accidentally disabled DNS service on IPv6 protocols. I am perfectly aware of dangers of disabling IPv6 in recent Windows versions(2008 and up) but somehow I decided that DNS servers shouldn’t listen or respond on this addresses. This almost immediately led to an error like below:

Replication of DNS entries was working but GPOs etc. had problems.

What I did was:

  1. Note the IPv6 address of interfaces that should handle DNS requests on DNS servers and from DCs
  2. Make sure that IPv6 DNS for each interface that should be on the network has DNS registration enabled(for DCs and DNS at least)
  3. Enabled interfaces from #1 in the DNS Server properties in all servers so they handle DNS requests for IPv4 and IPv6

Now everything seems to work correctly, repadmin /syncall returns success. Happy days!

By |2018-09-27T09:57:30+00:00September 27th, 2018|Active Directory, Windows Server|0 Comments

About the Author:

I am passionate about Systems Administration. I like to face new challenges and test new environments.Windows and Linux Debian boxes (both physical and virtual) are my favourites. I like solving problems related to Windows Server roles and services as well as Linux but some distributions in particular. I'm not considering myself as Linux master but surely, I always do my best to fit the needs. On the other hand I consider myself as a Windows Server Professional and in terms of WS and Windows Desktops I always follow best practices, good advices and opinions from other admins.

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