We have a main office with a satellite office connected by vpn permanent tunnel (sonicwall firewalls on both ends). All users log on to one domain, the domain controller is in the main office. One laptop is having intermittent problems logging on to the domain from the remote site. When they try to log on to Windows, it just says "domain not available", and I can only log on to the local pc. I can ping everything on both the remote and main offices, get on internet, etc, even when it won't log on to the domain. When I take the laptop to the main office, it logs on to the domain with no problem. In the past, I have got this to work by deleting the laptop from Active Directory, making it join a local workgroup, then making it rejoin the domain. It won't do that anymore, though, it just says domain not available after I do all this. Other computers on the remote office are not having this problem. What's the problem?