← 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 -sV to 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 klogin to 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

🔗 Related Remote Access Ports

Port 22
SSH
Port 23
Telnet
Port 512
rexec
Port 513
rlogin
Port 544
Kshell
Port 1494
Citrix-ICA
Port 1500
RDP-Alt
Port 2222
SSH-Alt
Port 2323
Telnet-Alt
Port 2598
Citrix-CGP
Port 3283
Apple-Remote
Port 3389
RDP

📍 Nearby Ports

Port 538
Port-538
Port 539
Port-539
Port 540
UUCP
Port 541
Port-541
Port 542
Port-542
Port 544
Kshell
Port 545
Port-545
Port 546
Port-546
Port 547
Port-547
Port 548
AFP
📚 Learn Network Scanning — Free Course
Found this useful? Share it.
Keep going
Free coursesStructured, day-by-day tracks Free hacking labsPractice in your browser, no setup Attack SimulatorHands-on challenges in your browser
Make it count. Join free to earn XP for what you read and solve, keep a streak, and track your progress.
Join free