What webhosting are you using? You'll need to talk with administrators of the webhosting to open outgoing connections to port 1433, maybe they won't open it for you, instead, you should get a webhosting for mu online since they always have 1433 port open for outgoing connections. Also, make sure you have your 1433 TCP port open for incoming connections, for security, I suggest you exclusively add the cPanel IP Address to connect to your port 1433 in your firewall, so no one else can try to connect to your database.
Let me know if you have any questions, happy to help.
