If you can’t connect to SQL Server on port 1433

Just had two fun days of troubleshooting this by working together with Adobe/Macromedia support, and found the solution.

Here’s the original issue: could not set up a new data source connecting locally (localhost, 127.0.0.1) to SQL Server 2000 Standard running on the web server; kept getting a SQL Exception error. Was told SQL just wasn’t listening on port 1433, or any TCP port for that matter, even though TCP/IP and Named Pipes were clearly enabled in the SQL Network Config Utility. Even in the registry, port 1433 was specified, yet I could not connect to SQL on TCP by any means. I couldn’t even telnet to the machine on that port.

Turns out that even though I’d upgraded SQL Server 2000 to SP4, I needed to downgrade to SP3. Still doesn’t make sense, after all, MS SPs are supposed to be roll-ups, but hey, that’s what worked. Luckily, the server I was working was running on VMware, so I reverted to a snapshot I took after I installed SQL and before I upgraded to SP4. Installed SP3, and was able to set up the data source immediately! Something to keep in mind if you’re in the same boat.

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Author: Raoul Pop

Entrepreneur, consultant, filmmaker, photographer and watch collector

5 thoughts on “If you can’t connect to SQL Server on port 1433”

  1. Try Cliconfig from Run-> see the Tcp\ip port specified there , check in SQL side if that port is not blocked.

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  2. Spent the whole day troubleshooting.. finally found your article & got it working..

    Thanks sooo much mate!!!

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