Port 1433 is used by Microsoft SQL Server (MSSQL). Microsoft SQL Server database connections. Used by Windows applications to communicate with SQL Server databases.
What Does an Open Port 1433 Mean?
A Microsoft SQL Server database is exposed. Database ports should NEVER be directly exposed to the internet. Use a VPN or SSH tunnel for remote database access.
This port should NOT be open to the public internet on typical systems. If you see it open, investigate immediately.
Security Risk Level
Critical Risk
How to Check if Port 1433 Is Open
Use the ExamineIP Port Scanner to check if port 1433 is open on any IP address from the public internet. Enter the target IP and select the relevant port preset.
How to Close Port 1433
- Stop the service using port 1433 if you no longer need it
- Add a firewall rule blocking inbound connections on port 1433
- Check your router for port forwarding rules that expose this port
- Run
netstat -ano | findstr :1433(Windows) to see which process is using it
Related Ports
MSSQL is related to: {implode(‘, ‘, Array)}
Protect Your Open Ports
If you need services like remote access, use a VPN to create a private encrypted tunnel instead of exposing ports directly to the internet. A VPN also hides your real IP address so port scanners cannot identify your device. Try PureVPN or IPVanish.