DevOps & Cloud
Risk: High
Port 2376 — Docker REST API (TLS Encrypted)
Port 2376 is the official secure port for Docker daemon API communication using mutual TLS authentication.
PORT NUMBER
2376
PROTOCOL
TCP
DEFAULT PROCESS
dockerd
FIREWALL TARGET
2376/tcp
Instant Terminal Fixes for Port 2376
macOS & Linux Terminal
1. Check who is listening on port 2376:
sudo ss -tulpn | grep 23762. Kill process occupying port 2376 (EADDRINUSE fix):
sudo systemctl restart docker3. UFW Firewall Allow rule:
sudo ufw allow 2376/tcpWindows PowerShell (Admin)
1. Check listening port:
Get-NetTCPConnection -LocalPort 23762. Force kill process on port 2376:
Restart-Service docker3. Docker Port Forwarding Mapping:
dockerd --tlsverify --tlscacert=ca.pem --tlscert=server-cert.pem --tlskey=server-key.pem -H tcp://0.0.0.0:2376Common Error Encountered
tls: bad certificate error communicating with Docker daemon on port 2376
Security Advisory & Hardening
Ensure client certificates are signed by a trusted CA and verified before authorizing any Docker container commands.
Frequently Asked Questions
Port 2376 Questions & Answers
Common questions regarding default services, kill commands, and firewall configurations.
Port 2376 is commonly used for Docker REST API (TLS Encrypted). Port 2376 is the official secure port for Docker daemon API communication using mutual TLS authentication.