connect to an external sql server from window form

Hi, I am workin' on a small windows application in Visual studio .net using c# and I want to access a ms sql server over the internet... How can I do this? What should my connection string look like?? The servers ip is "skylab1.te.hik.se" port 25000. the server name is "SKYLAB1\INST2" the database name is "BreemerChat". I use Sql server authentication (don't wont to post the logins ;)). earlier I used an alias in the client network utility (wich worked fine) but that doesn't work on other computers, that havn't got an alias... I am a beginner when it comes to this so please help me!