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Original report (<email@example.com>):
I believe I have found a bug in Win32 putty .53b. (found in Win2000, also tested current dev binary). I am connection to a NetBSD server 1.6 running OpenSSH 3.4 on port 443, but had the same problem on an OpenBSD server with OpenSSH 3.4. I am connecting through an authenticated Microsoft Proxy server v2 on Windows 2000, using HTTP proxy services. Using Putty, the connection conversation is: CONNECT 18.104.22.168:443 HTTP/1.1 Host: 22.214.171.124:443 Proxy-Authorization: basic YW1leeljYXNcc3RldmVfYmFya2V5OmluZXNzMTA= HTTP/1.1 407 Proxy Access Denied Server: Microsoft-IIS/5.0 Date: Tue, 31 Dec 2002 19:32:43 GMT Connection: close Proxy-Authenticate: Negotiate Proxy-Authenticate: NTLM Proxy-Authenticate: Basic realm="126.96.36.199" And the connection fails with putty event log: "2002-12-31 14:48:08 Connecting to 188.8.131.52 port 443 2002-12-31 14:48:08 Proxy error: 407 Proxy Access Denied" Using MindTerm 2.0 (an inferior java ssh client), the connection conversation is: CONNECT 184.108.40.206:443 HTTP/1.0 proxy-connection: Keep-Alive pragma: No-Cache user-agent: MindTerm/$Name: $ HTTP/1.1 407 Proxy Access Denied Server: Microsoft-IIS/5.0 Date: Tue, 31 Dec 2002 19:33:05 GMT Proxy-Authenticate: Negotiate Proxy-Authenticate: NTLM Proxy-Authenticate: Basic realm="220.127.116.11" ----------- and then ----------- CONNECT 18.104.22.168:443 HTTP/1.0 proxy-authorization: Basic YW1leeljYXNcc3RldmVfYmFya2V5OmluZXNzMTA= proxy-connection: Keep-Alive pragma: No-Cache user-agent: MindTerm/$Name: $ HTTP/1.1 200 Connection established Via: 1.1 YYZXPROXY01 SSH-1.99-OpenSSH_3.4 NetBSD_Secure_Shell-20020626 SSH-2.0-MindTerm_2.0 2.0 (non-commercial) ... encrypted, successful connection ....
Another user has experimented with this, and concluded that the problem is
that the proxy insists that the authentication scheme be "
rather than "
states that the scheme token is case-insensitive, but in the interests of
being conservative in what we send, PuTTY should probably use
This bug should be fixed as of proxy.c rev 1.27.
Audit trail for this semi-bug.