Port 873 — rsync
Quick reference for TCP/UDP port 873, used by rsync. Includes what the service does, security guidance and related ports.
What is port 873?
Remote file sync.
What port does rsync use?
rsync listens on port 873 by default.
Security guidance
High risk — do not expose to the internet
Port 873 (rsync) 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 873 used for?+
Port 873 is the standard TCP/UDP port for rsync. Remote file sync.
What port does rsync use?+
rsync listens on port 873 by default.
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