Port 543 — klogin
Quick reference for TCP/UDP port 543, used by klogin. Includes what the service does, security guidance and related ports.
What is port 543?
Kerberos remote login.
What port does klogin use?
klogin listens on port 543 by default.
Security guidance
High risk — do not expose to the internet
Port 543 (klogin) is high-risk because the service it carries is a frequent target for credential attacks, brute force or unpatched-vulnerability scanning. Keep it bound to localhost or your VPN, never forward it directly on a router, and require strong authentication.
Related ports
Frequently asked
What is port 543 used for?+
Port 543 is the standard TCP/UDP port for klogin. Kerberos remote login.
What port does klogin use?+
klogin listens on port 543 by default.
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