For the internal IP question, I'm pretty sure that the classes :
192.*.*.* and
10.*.*.* must be used for internal network only.
So you are on an internal network.
Like DT II said, try to do that on you computer, verify that the computer's they want to access your database are on the same network (10.140.50.*), or if the router is configured to route the packet correctly, then try to ping the computer where the DB is runing on, then if that works, that's a bad news... (No, that just mean that if it work, and you're still cannot access your DB, I don't know how to resolve it..)