Port 3128 — Squid proxy
Quick reference for TCP/UDP port 3128, used by Squid proxy. Includes what the service does, security guidance and related ports.
What is port 3128?
Squid HTTP proxy.
What port does Squid proxy use?
Squid proxy listens on port 3128 by default.
Is port 3128 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 3128
Test-NetConnection HOST -Port 3128
nmap -p 3128 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 3128 (Squid proxy) 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 3128 used for?+
Port 3128 is the standard TCP/UDP port for Squid proxy. Squid HTTP proxy.
What port does Squid proxy use?+
Squid proxy listens on port 3128 by default.
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