All ports
Port423/TCP
opc-job-startPort
423
Protocol
TCP
Category
Well-Known
Service
opc-job-start
What is port 423?
Port 423/TCP is a Well-Known port, assigned by IANA for widely recognized services. It is associated with the opc-job-start service.
IBM Operations Planning and Control Start
Useful commands
nmapnmap -p 423 -sV example.comnetcatnc -zv example.com 423curlcurl -v http://example.com:423/telnettelnet example.com 423bash(echo > /dev/tcp/example.com/423) 2>/dev/nullFirewall commands
UFWAllow
sudo ufw allow 423/tcpDeny
sudo ufw deny 423/tcpiptablesAllow
sudo iptables -A INPUT -p tcp --dport 423 -j ACCEPTDeny
sudo iptables -D INPUT -p tcp --dport 423 -j ACCEPTfirewalldAllow
sudo firewall-cmd --permanent --add-port=423/tcpWindowsAllow
netsh advfirewall firewall add rule name="Open Port 423" dir=in action=allow protocol=TCP localport=423Security 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- Outdated versions with vulnerabilities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 423/TCP?
Port 423/TCP is associated with the opc-job-start service. IBM Operations Planning and Control Start
Is it safe to expose port 423 to the Internet?
It depends on the service and configuration. Port 423 (opc-job-start) is a Well-Known 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 423 is open?
You can use nmap: `nmap -p 423 -sV example.com`, netcat: `nc -zv example.com 423`, or the bash command: `(echo > /dev/tcp/example.com/423) 2>/dev/null && echo "Open" || echo "Closed"`.
How do I open or close port 423 on my firewall?
On Linux with UFW: `sudo ufw allow 423/tcp` (open) or `sudo ufw deny 423/tcp` (close). With iptables: `sudo iptables -A INPUT -p tcp --dport 423 -j ACCEPT`. On Windows: `netsh advfirewall firewall add rule name="Open Port 423" dir=in action=allow protocol=TCP localport=423`.
What applications and services use port 423?
Port 423/TCP is used by the opc-job-start service. Specific uses depend on the software and configuration. Check our related tools section for more information.