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I like to work out of coffee shops on weekends as a way to relax. However, sometimes when exploring new spots, it's inexplicably difficult to make a VPN connection to my office. I'm not terribly skilled in reading the logging output from the diagnostics built in with windows when the windows VPN client fails, though--is there a different way to detect a situation when VPN is being disallowed?
This isn't enough to test for a PPTP VPN, as IP Protocol 47 (GRE) also needs to be enabled, and this cannot be tested for in the same way. For IPSec, UDP ports 500 and 4500 along with IP Protocols 50 (ESP) and 51 (AH) are also required, again difficult to do a simple test for from the command line. – Mike Insch – 2011-07-20T12:12:31.070
@Mike Insch I was just giving an example (I wrote "for example). You would need to test the data port, in particular, which if that works, in most cases they are not blocking random ports. Yes, there are other things that could stop it, especially GRE. I am not suggesting that he try to test for every port that his VPN may use, but simply a general test. I also did say that the easiest way is simply to try it. – KCotreau – 2011-07-20T12:16:06.447