NPM behind NTLM proxy

I solved it this way (OS: Windows XP SP3):

1. Download CNTLM installer and run it.

2. Find and fill in these fields in cntlm.ini. Do not fill in the Password field, it's never a good idea to store unencrypted passwords in text files.

Username    YOUR_USERNAME
Domain      YOUR_DOMAIN
Proxy       YOUR_PROXY_IP:PORT
Listen      53128

3. Open console, and type these commands to generate password hashes.

> cd c:\the_install_directory_of_cntlm
> cntlm -H
Password: ...type proxy password here...
PassLM          D6888AC8AE0EEE294D954420463215AE
PassNT          0E1FAED265D32EBBFB15F410D27994B2
PassNTLMv2      91E810C86B3FD1BD14342F945ED42CD6

4. Copy the above three lines into cntlm.ini, under the Domain field's line. Once more, do not fill in the Password field. Save cntlm.ini.

5. Open the Service Manager (from command line: services.msc), and start the service called "CNTLM Authentication Proxy".

6. In the console, type these lines:

> npm config set proxy http://localhost:53128
> npm config set https-proxy http://localhost:53128
> npm config set registry https://registry.npmjs.org

7. Now npm view, npm install etc. should work. Example:

> npm view qunit
...nice answer, no errors :)

CNTLM answer was working for me, but with connection errors make npm unusable. I've fixed them by adding this header in CNTML.

Header      Connection: close

Another alternative is to use Px for Windows which talks NTLM on your behalf like Cntlm and NTLMAps without having to provide your credentials. It uses the logged in user's credentials via SSPI.