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I'm trying to use PuTTY v0.63 to connect a proxy server. In the Proxy setting,

Proxy type = HTTP Proxy hostname and port are correct

If I don't put in the username and password, I get an error message,

Proxy error: 407 Proxy Authentication Required If I put in the user name and password (windows AD account), I get another error message,

Proxy error: 500 Internal Server Error 

I had no issues with the same setting some days ago. Not sure what changed on the server side (I have no rights to server).

By the way, on the same PC, same network, I have no problem using the proxy server with IE. In the IE proxy setting, I set the proxy to the same IP and port.

Any suggestions?

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