Mail server settings changing on 10.6.8 server.

We are running Snow Leopard server at our office.  It has the latest patches installed.  We have had a couple of instances where the domain and computer name were changed back to local and computername.local on their own, we did not change them.  Of course we discover this when the email server stops working and we have to go back in and reset the values.
We've had similar things happen to the samba setup on it where the PDC domain settings changes back to WORKGROUP on its own.
What in the world would be causing this?
Thanks

> The DNS on our server is configured to forward queries to our firewall appliance which acts as a proxy to our ISP DNS.
Your ISP DNS servers cannot resolve IP addresses in a private NAT'd network.  (The ISP DNS server doesn't have a unique translation for any hosts on a private network, because each client of the ISP is on a different private network, and often with conflicting IP address assignments.)
Are you also using the same domain name and the same host names inside your gateway, and in DNS services outside your NAT'd network?
DNS forwarding is unnecessary if/when the OS X Server DNS Server is configured and operational.  Forwarding also slows down DNS resolutions, as it adds an extra hop.  The local DNS server is already caching translations so it won't send out a query for a cached translation, which means the only way the ISP DNS server is a "win" is if it has a cached translationf or the target host.  Otherwise, it does the same thing the local DNS server on the OS X Server box does; it queries the remote DNS server addresses and gathers up the translation and returns it.
And FWIW, the 192.168.1.0/24 block is an IP routing problem if/when you get to VPN connections, but that's another discussion.  The 192.168.0.0/24 has similar issues.  Half the cafe and home networks on the planet use that block, which means the same subnet on both ends of the VPN connection, which means that IP routing doesn't know if it should send packets for that subnet directly to the local host on the local subnet, or if it should send the packets via the VPN connection.

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