How do I re-establish a trust between two servers and how can I add a third server to the domain so it's services can be shared without duplicating user names on multiple servers?

I have a third party company maintaining a static VPN from one main location to two other offices.  there is a 2000 or a 2003 box at each location but there is only one database server at the central location.  there are point of sale systems at each location and they all need to connect to the one database server.  it would appear that HQ has a pdc and a file server and a stand alone database server.  the file server is trusted by the pdc.  the pdc at HQ seems aware of the pdc at location A but it' is grey'd out and claims it can't connect to it.  The pdc at HQ is not aware of the pdc at location B.  never the less, the workstations at all three sites have been connecting to a share on all three servers until tonight.  Now the workstations at location B are still working and none of the ones at location A can open a share on the pdc at HQ or the stand alone server at HQ.  They can all ping each other as if they were on the same network.  HQ is 192.168.0.xxx.  location A is 192.168.10.xxx and location B is 192.168.20.xxx.  A connects through vpn to HQ and B connects through vpn to HQ but A and B are not connected to each other.
jglazer63Asked:
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Chris DentConnect With a Mentor PowerShell DeveloperCommented:
Okay, the suffix helps the client resolve by hostname only, but it looks like we need to be checking name resolution handled by your DCs.

Presumably all clients on each side of the trust refer to their local DNS server for name resolution?

On those, what have you configured to allow the server to resolve names in the remote domain?

Chris
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Chris DentPowerShell DeveloperCommented:

How have you configured DNS to allow each domain to resolve names within the other?

Chris
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jglazer63Author Commented:
I am not aware of any dns server being present in that network.  I am headed there now and I will look at that too.  Isn't there a way to have a shared host file for all the workstations so these ip's and names can be already known?
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Chris DentPowerShell DeveloperCommented:

To an extent we can use DNS for that, but to resolve by host name only each system will need a DNS suffix search list configuring.

Chris
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jglazer63Author Commented:
they are already configured with a suffix.  HQ.local and A.local and B.local, if "HQ" and "A" and "B" were the actual names.
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jglazer63Author Commented:
After restarting the servers at both ends, I can no longer use the name and when I try to open a share using the ip, I get this error message: "There are currently no logon servers available to service the logon request"...
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jglazer63Author Commented:
If I go into the trust properties and highlight the once working trust and press the 'validate' button, I get the error message: "Windoes cannot find a domain controller for the A.local domain.  Verify that a DC is available and then try again." and this is where I'm stuck.
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