Opened 7 days ago

#26689 new defect

No support for an upstream proxy that uses NTLM authentication

Reported by: irl Owned by:
Priority: Medium Milestone:
Component: Core Tor/Tor Version:
Severity: Normal Keywords:
Cc: luca@… Actual Points:
Parent ID: Points:
Reviewer: Sponsor:


Many corporate/enterprise environments still have proxies that use NTLM authentication also sometimes referred to as the NT challenge/response (NTCR) scheme. As far as I can tell, this is old Microsoft products that just refuse to die.

The following document explains the protocol:

There does appear to be a C library implementing the protocol at:

There is also a Python 1.x implementation at:

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