curl.exe -vvv --proxy 10.2.0.254:8080 --proxy-negotiate --proxy-user : http://www.example.com

* Rebuilt URL to: http://www.example.com/
* Hostname was NOT found in DNS cache
*   Trying 10.2.0.254...
* Connected to 10.2.0.254 (10.2.0.254) port 8080 (#0)
> GET http://www.example.com/ HTTP/1.1
> User-Agent: curl/7.37.1
> Host: www.example.com
> Accept: */*
> Proxy-Connection: Keep-Alive
>
< HTTP/1.1 407 Proxy Authentication Required ( The ISA Server requires authorization to fulfill the request. Access to the Web Proxy filter is denied.  )
< Via: 1.1 ISA10
< Proxy-Authenticate: Negotiate
< Proxy-Authenticate: Kerberos
< Proxy-Authenticate: NTLM
< Connection: Keep-Alive
< Proxy-Connection: Keep-Alive
< Pragma: no-cache
< Cache-Control: no-cache
< Content-Type: text/html
< Content-Length: 4107
<
* Ignoring the response-body
* Connection #0 to host 10.2.0.254 left intact
* Issue another request to this URL: 'http://www.example.com/'
* Found bundle for host www.example.com: 0x39f990
* Re-using existing connection! (#0) with host 10.2.0.254
* Connected to 10.2.0.254 (10.2.0.254) port 8080 (#0)
* Proxy auth using GSS-Negotiate with user ''
> GET http://www.example.com/ HTTP/1.1
> Proxy-Authorization: Negotiate TlRMTVNTUAABAAAAt7II4gMAAwAwAAAACAAIACgAAAAFAs4OAAAAD1RFTUlTQTEwSVNB
> User-Agent: curl/7.37.1
> Host: www.example.com
> Accept: */*
> Proxy-Connection: Keep-Alive
>
< HTTP/1.1 407 Proxy Authentication Required ( Access is denied.  )
< Via: 1.1 ISA10
< Proxy-Authenticate: Negotiate TlRMTVNTUAACAAAABgAGADgAAAA1wonioBTO6AT2AsJISWsAAAAAAGoAagA+AAAABQLODgAAAA9JAFMAQQACAAYASQBTAEEAAQAQAFQARQBNAEkAUwBBADEAMAAEAA4ASQBTAEEALgBUAEUATQADACAAdABlAG0AaQBzAGEAMQAwAC4ASQBTAEEALgBUAEUATQAFAA4ASQBTAEEALgBUAEUATQAAAAAA
< Connection: Keep-Alive
< Proxy-Connection: Keep-Alive
< Pragma: no-cache
< Cache-Control: no-cache
< Content-Type: text/html
< Content-Length: 0
<
* Connection #0 to host 10.2.0.254 left intact