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Why can't I use port 1433?

I have configured SQL Server 13 to Allow Remote Connections, I've also enabled TCP/IP and verified the port specified is 1433. The computer running SQL server has the firewall disabled. I have forwarded port 1433 on my router. I can connect to the SQL server from another computer in the LAN, but not outside the LAN.

I tried changing the SQL Server TCP/IP listening port to 49172 and I was able to connect to the official site SQL server outside the LAN. Why can't I use port 1433? I've disabled every type of security option on my router. I have a Sophos UTM9 firewall/router.

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0 Karlos over 5 years ago

Hi Leo,

Have you run a packet capture on your XG WebAdmin while trying to access your SQL server externally using port 1433?

Could you please post the output so we can analyze?

Thanks,

Karlos
Community Support Engineer | Sophos Technical Support
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