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Port 1080 — SOCKS proxy

TCP registered

What runs on port 1080

SOCKS4/5 proxy protocol, also what `ssh -D` opens.

The SOCKS proxy port, and what ssh -D 1080 opens for a dynamic tunnel. SOCKS operates below the application layer, so it proxies anything TCP rather than just HTTP. An open SOCKS proxy reachable from the internet will be found and used to launder traffic within days, which is why the SSH form should always be bound to localhost rather than to all interfaces.

Security considerations

An open SOCKS proxy will be found and abused. Bind it to localhost.

Checking whether something is listening

# Linux / macOS — what is bound to the port
sudo lsof -i :1080
sudo ss -lntp | grep :1080

# Windows
netstat -ano | findstr :1080
Get-NetTCPConnection -LocalPort 1080

# is it reachable from outside?
nc -zv example.com 1080
curl -v telnet://example.com:1080

Freeing the port

# find the process, then stop it
sudo lsof -ti :1080 | xargs kill        # Linux / macOS
netstat -ano | findstr :1080            # note the PID, then:
taskkill /PID <pid> /F                    # Windows

Should this port be open to the internet?

Usually not. Expose it only if a specific external client needs it, and restrict by source address where you can.

Opening or blocking port 1080

Finding the port is usually the first half of the job. Start narrow — the second rule is there for services that genuinely serve the public, and most do not:

# ufw — Debian, Ubuntu
sudo ufw allow from 10.0.0.0/8 to any port 1080 proto tcp
sudo ufw allow 1080/tcp                   # only if it genuinely serves the public

# firewalld — RHEL, Fedora, CentOS
sudo firewall-cmd --permanent --add-rich-rule='rule family=ipv4 source address=10.0.0.0/8 port port=1080 protocol=tcp accept'
sudo firewall-cmd --reload

# iptables, if you are still there
sudo iptables -A INPUT -p tcp --dport 1080 -s 10.0.0.0/8 -j ACCEPT
sudo iptables -A INPUT -p tcp --dport 1080 -j DROP

# Windows
New-NetFirewallRule -DisplayName "SOCKS proxy 1080" -Direction Inbound -Protocol TCP -LocalPort 1080 -RemoteAddress 10.0.0.0/8 -Action Allow

10.0.0.0/8 stands in for a private range — substitute your own. Note that a firewall rule does not undo a service bound to 0.0.0.0; it only stops packets reaching it, and a misconfigured or disabled firewall then exposes it immediately.

Quick reference

Port1080
ProtocolTCP
ServiceSOCKS proxy
RangeRegistered (1024–49151) — any user process may bind

Frequently asked questions

What is port 1080 used for?

SOCKS4/5 proxy protocol, also what `ssh -D` opens.

Is it safe to open port 1080?

An open SOCKS proxy will be found and abused. Bind it to localhost.

How do I check if port 1080 is open?

Locally, sudo lsof -i :1080 on macOS or Linux, or netstat -ano | findstr :1080 on Windows. From outside, nc -zv host 1080 tells you whether anything answers.

Why do I get "address already in use" on port 1080?

Another process is bound to it — often a previous run of your own program that did not exit cleanly. Find it with lsof -ti :1080 and stop it, or configure your application to use a different port.

Can I change the port this service uses?

Almost always yes, in the service's configuration. Moving off a default port reduces automated scan noise, but it is obfuscation rather than security — a real attacker scans all 65,535.

Other common ports

All port numbers