SVN refuses to authenticate against ISA proxy

Hi,

I've been using SVN for several months. Recently, I've been assigned
to work at a client on-site, and they have an ISA proxy set up on
their network. I'm running SVN on Windows XP, and whenever I try to
access our repository via HTTPS, I get the following error on the
command line:

svn: PROPFIND request failed on '/svn/globe-txtconnect'
svn: PROPFIND of '/svn/globe-txtconnect': Could not create SSL
connection through proxy server (https://linuxdev.asiaonline.net.ph)

My servers file (in my Application Data\Subversion directory) contains
the following relevant configuration lines:

[global]
http-proxy-host = 192.21.200.132
http-proxy-port = 8080
http-proxy-username = username
http-proxy-password = password

where username and password are obviously the necessary credentials on
the ISA server.

I sniffed the connection from Ethereal, and the dump shows the client
connecting to the proxy, but not providing the credentials in the
CONNECT HTTP request. In comparison, the credentials are passed when
browsing the repository (https) from Mozilla Firefox (via the
Proxy-Authorization: header).

I've noticed that the ISA proxy accepts the Kerberos, NTLM, and
Negotiate protocols. (And I now realize that this might be more
appropriate to the Neon mailing lists...).

Is there a workaround or fix that I can use to get through the ISA proxy?

TIA,

-- 
JM Ibanez
   - A million monkeys can't go wrong...
http://www.livejournal.com/~jmibanez/
http://www.mycgiserver.com/~butiki/
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