proxy authentication


I use CIS on several computers. I downloaded updates thorough squid proxy, without authentication. I want to switch to another proxy (squid too), with authentication (it would be the best to use ntlm auth, not basic). I use Firefox and Internet Explorer with ntlm authentication with that second proxy. My problem is that CIS doesn’t work with proxy authentication for me. Here is the squid authentication configuration (I tried basic auth, with no success):

auth_param ntlm program /usr/bin/ntlm_auth --helper-protocol=squid-2.5-ntlmssp
auth_param ntlm children 30
auth_param basic program /usr/bin/ntlm_auth --helper-protocol=squid-2.5-basic
auth_param basic children 5
auth_param basic realm Squid proxy-caching web server
auth_param basic credentialsttl 1 hours

acl AuthorizedUsers proxy_auth REQUIRED
http_access allow all AuthorizedUsers

1254124748.418 0 TCP_DENIED/407 2559 GET - NONE/- text/html

Any idea would be appreciated.
Thanks, in advance.

Hi PischTa,

Error 407 means squid requires authentication, your real error message should be in the cache.log file
I assume you set the right credentials on the CIS, Misc, Connections tab ?

I found the solution. It was simple. For the authentication, I have to give the username in domain\username format.

Hi can I use this format?

Say your Windows Domain is TEST and your username is USER then you have to fill the “Login:” like this


Nice, but I got a problem

I’m behind a proxy on my university (the only access point for my notebook) and it’s very slow to download the virus definitions (I have a fresh installation, so there’s a ton of them).
Is there a way to download it as a package (at a lan house with good speed) and install it on my notebook after?

Thanks for all

yup download them from here save the file to your desktop, restart in safe mode, navigate to C:/program files/comodo/comodo internet security/scanners/ , drag and drop from desktop, when it asks you to replace, say yes. Restart in normal mode, hit the update once more ( to catch any incremental ones). That’s it you are updated.

It works!