Problems connecting to MSDE through ADO.NET

Hi there,
i've installed MSDE and have successfully connected to it from a remote version of Enterprise Manager but when i try to connect using ADO.NET from a website using the same login details i get the following message:
"SQL Server does not exist or access denied"
I installed msde with DISABLENETWORKPROTOCOLS=0 and SECURITYMODE=SQL so everything should be setup properly.
My connection string looks like this:
server=ip_address\instance_name;uid=myusername;pwd=mypassword;database=mydatabase
This connection string works fine when testing locally (without ip address ie. localhost\instance_name)
Any ideas why this doesn't work??You need to check that if the user has accessto the database. For most hosting companies they provide ASPNET useraccount and also NETWORK users. Give permission to ASPNET user and seeif it works also try the same for NETWORK users.

|||Thanks for the reply, you've lost me a bit though. I've setup my own server using Apache and mod_aspdotnet and have successfully tested it remotely from asp.net pages connecting to a MySQL database also on my server. Now i wish to use MSDE and am getting this problem.
How do i setup an ASPNET user account and give it permission to use the database? And why do i need to?
cheers