Can't connect to domain resources through vpn to windows 2000 server

Can you get to the server if you use the IP?  e.g: \\x.x.x.x
Can you get to the server if you use a fully qualified domain name?  e.g: \\server.domainsuffix


"I get an error that states that the system detected a possible attempt to compromise security."
From where do you get that error?  I'm assuming the server?

If so do you have a host-based firewall running on the server?  If so which firewall product are you using?

1. try net use * \\xxx.xxx.xxx.xxx\<share> /u:<DOM>\<username> *
2. type in password
3. Check against your windows firewall...probablly is up :)

Connect using "log on using dialup connection". only way to ensure you are authenticated to the domain

I ended up enabling DHCP on the server and it seemed fix the problem.  But then I started receiving IP address conflicts on the network.  The strange thing is it says the conflict is coming from a mac address that I do not know where? and ii is theconflicting with the 192.168.0.100 (same as the server?)  I know that no other hardware has the address?  After much frustration I turned off DHCP on the server and enabled it on my router like it was before I started this project.  Now I am getting this strange occurance when I restart any workstation on the network.  After I log in I get sporadic connection errors when try to connect to drives and resources on the server.  If I wait a few minutes and try again it seems to let me connect if I try accessing the resource. Then, as long as you don't restart the client it seems to continue to work?? I am going to post what I can from memory as to how I have the server configured.:

Windows 2000 server sp4 setup as a DC

I have the NIC card setup as static ip of 192.168.0.100
Subnet 255.255.255.0
Gateway 192.168.0.1
DNS: 192.168.0.100

In DNS settings I have DNS forwarders turned on and I have the dns servers from our isp in there

In the router I have DHCP enabled and it is setup to hand out addresses between 192.168.0.100-192.168.0.199 I also have a reservation in the router to reserve ip 100 for the server,   In the DNS settings in the router I have 192.168.0.100 and the other one is one from our isp.  All workstations are setup to pull ips and dns automatically and I verified that the dns server numbers are showing u pin iconfig.  One setting I curious about in dns is the Round robin.  I can't remembr how that was set before - should it be on or off?  I am at the point that I am considering restoring the server to prior state.  What kind of nightmares am I starting by doing that?  Will the workstations reconnect after restore or will I have to re-join them to the domain?

Help!