cntlm ☆

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Description:
NTLM authentication proxy with tunneling

Type: Formula | Latest Version: 0.92.3@0 | Tracked Since: Dec 17, 2025

Links: Homepage | formulae.brew.sh

Category: Networking

Tags: proxy ntlm tunneling networking authentication

Install: brew install cntlm

About:
Cntlm is a fast and lightweight NTLM proxy that authenticates against NTLM-based parent proxies. It supports connection tunneling and allows users to cache credentials, enabling seamless internet access through corporate firewalls from command-line tools and other applications.

Key Features:

High-performance authentication caching
Connection tunneling and port forwarding
Support for NTLMv2 and NTLMv1 protocols
Configurable via a single configuration file
Minimal resource footprint

Use Cases:

Enabling command-line tools (git, curl, wget) to work behind corporate NTLM proxies
Tunneling traffic through restrictive firewall environments
Centralizing proxy authentication for multiple applications on a single machine

Alternatives:

NTLMAPS – Cntlm is generally considered faster and more actively maintained than NTLMAPS.
Corkscrew – Corkscrew is for HTTP tunneling but lacks built-in NTLM authentication capabilities.

License: GPL-2.0-only

Bottles available for: arm64_tahoe, arm64_sequoia, arm64_sonoma, arm64_ventura, arm64_monterey, arm64_big_sur, sonoma, ventura, monterey, big_sur, catalina, arm64_linux, x86_64_linux

Important Notes:

Edit $HOMEBREW_PREFIX/etc/cntlm.conf to configure Cntlm

Version History

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