Check http://whatismyipaddress.com/ and see if you can ping this IP from the remote computer.

>Thanks, how do I determine if I have a public IP?
>
>I'll look into Hamachi as well.
>
>>That would only work if you have a public IP, and then you have to set port forwarding at the router.
>>
>>If you don't have a public IP address, a workaround would be to create a network using Hamachi from LogMeIn, I did that once and it was pretty easy to setup, and it's free if I remember correctly.
>>
>>>I believe that I have that configured as I am able to connect to the database from a different PC on the local network.
>>>
>>>I understand that I need to know the IP address of the database server, how would I determine that? This is what I would need to use in my connection string from the PC outside the LAN.
>>>
>>>>In SQL Server Management Studio, did you check "Allow remote connections" in the server properties?
>>>>
>>>>
>>>>>This is actually SQL Server Express 2012 .
>>>>>
>>>>>I have two PCs in a workgroup at a client. Both running Win 7 Home Premium. I have installed SQL Server Express 2012 on one and my system running on that PC is able to access it.
>>>>>
>>>>>I have:
>>>>>
>>>>>1. enabled TCP/IP and named pipes
>>>>>2. set dynamic ports to blank and set a TCP port number
>>>>>3. Added an exception for this port number in Windows firewall
>>>>>
>>>>>Is there anything I am missing? I can't access the data from the other PC.
>>>>>
>>>>>Update
>>>>>
>>>>>I found that I had changed the dynamic ports on IP2 (or was it IP4?) instead of IPALL. Once I did that I was able to connect.
>>>>>
>>>>>Now my next challenge is to allow a remote computer access to the database over the internet. Any suggestions of where to find instructions on how to do this?