How do I monitor network connections to see what address a certain program is contacting

I made a program many years ago, that connects to a SQL Server database (port 1433), and I no longer have the code for this application, but I need to know whether it is trying to connected to the domain name exampleDomain.com or if it is connecting directly to the IP address, xxx.xxx.xxx.xxx.

I need to find this out because I want to switch hosting providers, but cannot 开发者_如何学Pythonlet this application stop working, so I'm not sure if changing the IP Address of the SQL server will affect the program.

Is there a way I can tell what this program is connecting to? The raw IP Address or the domain Name?

thanks.

Use wireshark. http://www.wireshark.org/

It's free, easy to use, and very powerful.

You can monitor all traffic coming out of your PC and you can filter the traffic by type. So first I would look for any DNS communication that has MyDoman.com and then look at TCP connections.