As you can see in this error message from our intranet I'm having problems connecting from our EC2 web server to an external MS SQL database hosted elsewhere.
A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server)
I have tryed: "telnet ip.address 1433" on the web server.
And get the following message: Could not open connection to the host, on port 1433: Connection failed.
Therefor I'm guessing the problem is related to the Amazon security groups or the host of the MS SQL servers firewall.
The host should have opened port 1433 for our web servers ip-address regarding to them.
If thats so I'm guessing that leaves it to our own Amazon security group settings, I have tried opening TCP port 0 - 65535 but nothing changed.
I have minimal configuration experience on firewalls.
Any help on what to do or check to bug find this problem?