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Why can I connect to SQL port 1433 locally, but not remotely?

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http://serverfault.com – I have a pair of EC2 servers, one IIS, one SQL 2008. This morning, the web app started complaining that the SQL server "doesn't exist". Upon investigation, I found SQL doesn't appear to be accepting connections on port 1433. From the web server, I have tried connecting various ports via telnet (80, 445, 3389) all without issue. However "telnet [SQL IP] 1433" fails. I have verified SQL is listening on 1433: C:\>netstat -a |findstr 1433 TCP 0.0.0.0:1433 ip-0A30XXX2:0 LISTENING TCP [::]:1433 ip-0A30XXX2:0 LISTENING The really weird part i (HowTos)