Is your instance on Computer A your default instance or is it a named instance?
Do you have a DNS that will solve Computer A name for your Server B?
Do you use the same network or your Computer A is in a different network than your Server B?
If different network, can you connect to your Computer A from Computer A using external IP?
Commonly you would use something like this:
Luis C.General Disclaimer:
Are you seriously taking the advice and code from someone from the internet without testing it? Do you at least understand it? Or can it easily kill your server?How to post data/code on a forum to get the best help: Option 1 / Option 2