All ports
Port1433/UDP
ms-sql-sPort
1433
Protocol
UDP
Category
Registered
Service
ms-sql-s
What is port 1433?
Port 1433/UDP is a Registered port, registered with IANA for specific applications. It is associated with the ms-sql-s service.
Microsoft-SQL-Server
Useful commands
nmapnmap -p 1433 -sV example.comnetcatnc -zv example.com 1433curlcurl -v http://example.com:1433/telnettelnet example.com 1433bash(echo > /dev/udp/example.com/1433) 2>/dev/nullFirewall commands
UFWAllow
sudo ufw allow 1433/udpDeny
sudo ufw deny 1433/udpiptablesAllow
sudo iptables -A INPUT -p udp --dport 1433 -j ACCEPTDeny
sudo iptables -D INPUT -p udp --dport 1433 -j ACCEPTfirewalldAllow
sudo firewall-cmd --permanent --add-port=1433/udpWindowsAllow
netsh advfirewall firewall add rule name="Open Port 1433" dir=in action=allow protocol=UDP localport=1433Security Risks
- Unauthorized access to the service
- Data exposure if the service is unauthenticated
- Outdated versions with vulnerabilities
- Incorrect service configuration
Frequently Asked Questions
What service runs on port 1433/UDP?
Port 1433/UDP is associated with the ms-sql-s service. Microsoft-SQL-Server
Is it safe to expose port 1433 to the Internet?
It depends on the service and configuration. Port 1433 (ms-sql-s) is a Registered port. If you need to expose it, keep the service updated, use strong authentication, and configure a firewall. It's always recommended to restrict access by IP when possible.
How do I check if port 1433 is open?
You can use nmap: `nmap -p 1433 -sV example.com`, netcat: `nc -zv example.com 1433`, or the bash command: `(echo > /dev/udp/example.com/1433) 2>/dev/null && echo "Open" || echo "Closed"`.
How do I open or close port 1433 on my firewall?
On Linux with UFW: `sudo ufw allow 1433/udp` (open) or `sudo ufw deny 1433/udp` (close). With iptables: `sudo iptables -A INPUT -p udp --dport 1433 -j ACCEPT`. On Windows: `netsh advfirewall firewall add rule name="Open Port 1433" dir=in action=allow protocol=UDP localport=1433`.
What applications and services use port 1433?
Port 1433/UDP is used by the ms-sql-s service. Specific uses depend on the software and configuration. Check our related tools section for more information.