git over http not re-authenticating after 301 redirect?

When I do a git-push from a repository I set up, I get:

craven@craven-desktop:~/docs$ git push
Unable to create branch path
http://username:password@server.simpson.edu/my_repo.git/info
Error: cannot lock existing info/refs
error: failed to push some refs to
'http://username:password@server.simpson.edu/my_repo.git/'

The web log shows: 10.1.21.232 - username [06/Apr/2009:21:24:04 -0500] "PROPFIND /my_repo.git/ HTTP/1.1" 207 559 "-" "git/1.5.6.3" 10.1.21.232 - username [06/Apr/2009:21:24:04 -0500] "HEAD /my_repo.git/info/refs HTTP/1.1" 200 - "-" "git/1.5.6.3" 10.1.21.232 - username [06/Apr/2009:21:24:04 -0500] "HEAD /my_repo.git/objects/info/packs HTTP/1.1" 200 - "-" "git/1.5.6.3" 10.1.21.232 - username [06/Apr/2009:21:24:04 -0500] "MKCOL /my_repo.git/info HTTP/1.1" 301 383 "-" "git/1.5.6.3" 10.1.21.232 - - [06/Apr/2009:21:24:04 -0500] "MKCOL /my_repo.git/info/ HTTP/1.1" 401 536 "-" "git/1.5.6.3"

Note that after the 301 redirect, I don't seem to have a username sent anymore. I'm not sure this is the issue, but is seems like a possibility.

I have the same issue on other computers that have cloned the repository.

The /my_repo.git/info/ directory does exist.

I thought I had this working the first day I set it up, but now it no longer does. If someone could point me in the correct direction, I'd appreciate it.