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IIS Authentication problem

Hello guys,

One of our users is trying to access an website where authentication is required. We are running Astaro 7.402. The destination webserver is IIS. I tried the following:

- Surf to the site with Internet Explorer, without proxy. Authentication window appears.
- Surf to the site with Internet Explorer, with proxy. Authentication window doesn't appear.
- Surf to the site with Mozilla Firefox, without proxy. Authentication window appears.
- Surf to the site with Mozilla Firefox, with proxy. Authentication window appears.

I also sniffed the headers from the destination site.

Without proxy:
GET /x/x/index.html HTTP/1.1

Host: x.x.x.x
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; nl; rv:1.9.0.11) Gecko/2009060215 Firefox/3.0.11 GTB5 (.NET CLR 3.5.30729)
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: nl,en-us;q=0.7,en;q=0.3
Accept-Encoding: gzip,deflate
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
Keep-Alive: 300
Connection: keep-alive
Cache-Control: max-age=0

HTTP/1.x 401 Unauthorized
Content-Length: 1656
Content-Type: text/html
Server: Microsoft-IIS/6.0
WWW-Authenticate: Negotiate
WWW-Authenticate: NTLM

X-Powered-By: ASP.NET
Date: Fri, 03 Jul 2009 06:50:05 GMT


With proxy:
GET /x/x/index.html HTTP/1.1

Host: x.x.x.x
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; nl; rv:1.9.0.11) Gecko/2009060215 Firefox/3.0.11 GTB5 (.NET CLR 3.5.30729)
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: nl,en-us;q=0.7,en;q=0.3
Accept-Encoding: gzip,deflate
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
Keep-Alive: 300
Proxy-Connection: keep-alive
Cache-Control: max-age=0

HTTP/1.x 401 Unauthorized
Content-Type: text/html
Server: Microsoft-IIS/6.0
WWW-Authenticate: NTLM
X-Powered-By: ASP.NET
Date: Fri, 03 Jul 2009 06:50:59 GMT
Content-Length: 1656
Accept-Ranges: none
Proxy-Connection: Keep-Alive


It seems that Astaro strips one of the two WWW-Authenticate arguments. Is there an solution for this problem. I tried searching the forum, but didn't find a good solution for this. 

Thanks in advance,

Jasper


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