Domain across subnets - Cannot join RPC error

Hi there,

There's an issue with operating a Windows 2003 AD domain across two subnets.

The are two offices of the same company within one town. Recently the second
one got wired up with a permanent cable link and is connected to the main
office via VLAN. Main Office has LAN 192.168.10.0/24 and Branch office has
LAN 192.168.12.0/24, which has to be joined to the main office's domain. The
plan is to raise a DC at the Branch and tweak the replication intervals to
go over the VLAN link, bandwidth permits that okay.

Now, the link is working fine. The firewall of the Main Office LAN, which is
ISA 2004, has been setup to ROUTE the traffic between the subnets instead of
NAT and also all-permitting rule in both directions was added. When we try
to join the to-be-DC server at the Branch error comes up:

The remote procedure call failed...

The DNS for the joining server has been setup to be the DC at Main Office,
so that's fine. It's connecting to it okay and in fact can open fine any
network shares that we have in the 192.168.10.0 network (obviously the
username/password prompt comes up aksing for domain credentials).

NSLOOKUP resolves all hosts fine.

I am puzzled. Any ideas what else to try for resolution?

Thank you.
Alex A

 

The quickest way to check port traffic on both sides is to run portqry.
http://support.microsoft.com/default.aspx?kbid=832919

It souns like the rpc port is blocked, portqry has built in ports to scan.

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Paul Bergson MCT, MCSE, MCSA, CNE, CNA, CCA

This posting is provided "AS IS" with no warranties, and confers no rights.