Yakov Kopel created TS-1491:
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             Summary: Browser always prompts for authentication (NTLM)
                 Key: TS-1491
                 URL: https://issues.apache.org/jira/browse/TS-1491
             Project: Traffic Server
          Issue Type: Bug
          Components: Core
            Reporter: Yakov Kopel
             Fix For: 3.3.3


When the client surf through the ATS to a site of SharedPoint, the user get 
NTLM prompt message again and again.
This is because of the reuse option that is turned on by default (u can turn it 
off with the proxy.config.http.share_server_sessions option).
My attached patch turns on the private_session flag when the ATS gets auth 
connection, and then it will not use the reuse option for this connection.

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For further reading on this global bug in proxies:

http://blogs.msdn.com/b/asiatech/archive/2012/03/28/ie-always-prompts-for-authentication-when-browsing-through-proxy-server.aspx

Microsoft recommend at 
(http://technet.microsoft.com/en-us/library/cc995189.aspx):

“we recommend that you use SSL encryption for the traffic between Forefront TMG 
and the client. NTLM authentication is per connection, and encryption prevents 
improper reuse of connections by legacy proxy devices on the Internet.”


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