git push still gets RPC error after changing postBuffer

I know that this question is identical to another one in here, but my symptoms are different.

I followed the webfaction git tutorial, and have run this on my git instance:

$ git config http.postBuffer 524288000

Just to be clear, here's what's in the config of my repo:

$ cat config 
[core]
    repositoryformatversion = 0
    filemode = true
    bare = true
[http]
    receivepack = true
    postBuffer = 524288000

Regardless, this still happens:

$ git push
Counting objects: 74, done.
Delta compression using up to 4 threads.
Compressing objects: 100% (62/62), done.
error: RPC failed; result=22, HTTP code = 411
fatal: The remote end hung up unexpectedly
Writing objects: 100% (73/73), 3.67 MiB | 962 KiB/s, done.
Total 73 (delta 3), reused 0 (delta 0)
fatal: The remote end hung up unexpectedly

The wacky thing is that I'm not even pushing up that much data: only about 120MB. Now I'm still quite new to git, so I thought I might post my local .git/config file too:

$ cat .git/config 
[core]
    repositoryformatversion = 0
    filemode = true
    bare = false
    logallrefupdates = true
[remote "origin"]
    fetch = +refs/heads/*:refs/remotes/origin/*
    url = http://USERNAME:PASSWORD@MY.DOMAIN.TLD/REPONAME.git
[branch "master"]
    remote = origin
    merge = refs/heads/master

Honestly, I'm completely out of ideas. If someone can see what I've done wrong, I'd really appreciate it. Note that I know I can do this over SSH, but that's not ideal for my scenario.