← Port Encyclopedia
543
Klogin
TCP
Remote Access
High Risk
Kerberos authenticated login — Kerberized rlogin
🔍 How to Scan Port 543
nmap -sV -p 543 target
nmap -sV -sC --script=banner -p 543 target
nc -zv target 543
🛡️ Security Considerations
- Scan port 543 with
nmap -sVto identify the exact service and version - If Klogin is not needed, close or firewall this port immediately
- Check for default credentials if a management interface runs on this port
- Use
searchsploit kloginto find known exploits - Monitor traffic on port 543 with Wireshark or tcpdump for anomalies
- Ensure the service is patched to the latest version to prevent known CVE exploitation