(osx 10.4.11) can't push from linux to Apache on mac: can't access location

Apologies if this has been covered in the past -- I searched the nabble archives but didn't find the answer.

I'm new to git, and wanted to synchronize repositories between my main machine (OSX 10.4.11) and satellite net book (puredyne 9.10, based on ubuntu karmic). I've gotten as far as being able to get the directory listing in Firefox on the Mac (same machine where Apache is running) at http://ip.address/~username/git/kc ('git/kc' is the bare repository under ~/Sites/).

I tried to follow the directions in setup-git-server-over-http.txt:

- added at the end of the load module section of httpd.conf:

LoadModule dav_module libexec/httpd/libdav.so

- added at the end of the add module section of httpd.conf:

AddModule mod_dav.c

- added at the end of the file, just above the final "include":

DAVLockDB "/usr/local/apache2/temp/DAV.lock"

  <Location /git/kc>
     DAV on
     AuthType Basic
     AuthName "Git"
     AuthUserFile /usr/local/apache2/conf/passwd.git
     Require valid-user
  </Location>

- chmod -R ugo+w ~/Sites/git

git clone works.

git push... fails. The remote machine says that it couldn't access the location. Apache's access log shows:

"PROPFIND /~dewdrop/git/kc/ HTTP/1.1" 404 288

404? The folder most certainly exists.

Anyway, I'm confused. I'm not an expert in Web server configuration, would appreciate some advice.

Thanks! James