Hypothetical, of course. 
Many people running VPNs will use Back Office or a similar product. If that's the case, your easiest entry point will be to use Back Orifice which can be found at www.cultdeadcow.com .
If they're not using that method to access your network you'll need to find their IP address and access their computer that way. That kind of information should be available on your server. What kind of network are you running? Some kind of UN*X or an NT network?
For additional reference check www.2600.org . If you want to take a road trip this weekend, 2600's PhreakNic5.0 hackers convention is going on in Nashville Friday, Saturday and Sunday. (It just HAD to conflict with the Boone gathering.
) Might be worth checking out if you're trying this kind of thing.
Many people running VPNs will use Back Office or a similar product. If that's the case, your easiest entry point will be to use Back Orifice which can be found at www.cultdeadcow.com .
If they're not using that method to access your network you'll need to find their IP address and access their computer that way. That kind of information should be available on your server. What kind of network are you running? Some kind of UN*X or an NT network?
For additional reference check www.2600.org . If you want to take a road trip this weekend, 2600's PhreakNic5.0 hackers convention is going on in Nashville Friday, Saturday and Sunday. (It just HAD to conflict with the Boone gathering.