Port 2377 — Docker Swarm
Quick reference for TCP/UDP port 2377, used by Docker Swarm. Includes what the service does, security guidance and related ports.
What is port 2377?
Docker Swarm cluster management.
What port does Docker Swarm use?
Docker Swarm listens on port 2377 by default.
Is port 2377 open? How to check
Run one of these from your computer, replacing HOST with the IP address or domain you want to test.
nc -zv HOST 2377
Test-NetConnection HOST -Port 2377
nmap -p 2377 HOST
A refused or timed-out connection means the port is closed or filtered by a firewall.
Security guidance
Medium risk — open with care
Port 2377 (Docker Swarm) can safely face the internet if you keep the software up to date, restrict admin endpoints, and use TLS where possible. Audit who can reach it and watch your logs.
Related ports
Frequently asked
What is port 2377 used for?+
Port 2377 is the standard TCP/UDP port for Docker Swarm. Docker Swarm cluster management.
What port does Docker Swarm use?+
Docker Swarm listens on port 2377 by default.
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