Just like the title is:
Is there a way to get the authentication type of a squid proxyserver from a client in the local network?
Im using debian
UPDATE 1:
HTTP/1.1 407 Proxy Authentication Required
Server: squid/3.3.9
Mime-Version: 1.0
Date: Fri, 25 Apr 2014 17:51:25 GMT
Content-Type: text/html
Content-Length: 3305
X-Squid-Error: ERR_CACHE_ACCESS_DENIED 0
Vary: Accept-Language
Content-Language: en
Proxy-Authenticate: Basic realm="Squid Web Proxy"
X-Cache: MISS from domain.com
Via: 1.1 domain.com (squid/3.3.9)
Connection: keep-alive
I am only seeing the Basic realm line. So my Proxy only accepts Basic authentication right?
Best Answer
One thing you can do is inspect the HTTP response headers of a 407 (Proxy Authentication Required) response from your proxy. It should include the authentication schemes that it will accept from a client. You'll see something like this, one header for each scheme:
Based on your edit yes, your proxy won't accept NTLM authentication. Since there is just the one Proxy-Authenticate header for Basic, then your clients will only send Basic authentication. It seems your proxy is not configured (or at least properly) to accept anything other than basic authentication.