TortoiseSVN Not even asking for Authentication

I just setup a Win2K Server, with Apache 2.0.55, and Subversion 1.2.3, with Tortoise 1.2.4

I am using Windows domain authentication.

My location tag is as follows:

<Location /svn>
DAV svn
SVNParentPath "C:\SVN"

AuthName "Subversion repositories"

AuthType SSPI
SSPIAuth On
SSPIOmitDomain On
SSPIAuthoritative O
SSPIDomain www-pdc

<LimitExcept GET PROFOUND OPTIONS REPORT>
Require valid-user
</LimitExcept>

AuthzSVNAccessFile "c:/svn/AuthzSVNAccessFile.txt"
#AuthUserFile passwd
</Location>

I have the required load modules set as follows and they appear to be working
LoadModule sspi_auth_module modules/mod_auth_sspi.so
LoadModule dav_svn_module "C:/Program Files/Subversion/bin/mod_dav_svn.so"
LoadModule authz_svn_module "C:/Program Files/Subversion/bin/mod_authz_svn.so"

I can view in a browser http://svn.houstonisd.org/svn/Test/ This prompts for a Login as it should and with the proper login (from my domain account in the svnaccessfile) I am able to login. However, if I try to use Tortoise it doesn't even prompt for a login. I am attempting to checkout just my test repository for now but I can't seem to do anything.

The error I get is:
Error: PROPFIND request failed on '/svn/Test'
Error: PROPFIND of '/svn/Test': authorization failed (http://svn.houstonisd.org)

This is my first time setting this up and I'm so close I can taste it but I can't get the TortoiseSvn to connect. Can anyone help me?

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