When accessing any https sites using any web proxy the proxy resets the tcp socket.

I have a problem accessing with any browser, any HTTPS web sites (including gmail, yahoo..) if I use any web proxy. IE6 displays the 'The page cannot be displayed' message while Mozilla Firefox 2 says: 'The connection was reset'. The same https sites work perfectly if I connect directly to Internet with no proxies.

I tried with different proxies (both inside the company's LAN  and public ones), clearing the cache, temp files, certificates, update the network driver but it didn't help.

I took a Wireshark capture and what I can see is that whenever the browser sends the 'CONNECT' message to the proxy instead of receiving the 200 OK response, the tcp socket is reset by the proxy as if the request is somehow corrupted. I compared the 'bad' CONNECT message with a 'good' one (taken from another machine) but they seem to me pretty much the same.

Thanks a lot for any guidance,
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