### Please describe the problem.

After submitting the form in the webapp for adding a box.com remote, I get:

   Internal Server Error - WEBDAV failed to write file: "Unauthorized": user error

### What steps will reproduce the problem?

Fill in the box.com add remote form. Username=username, password=password, "share..."=checked, directory=annex, Encryption="Encrypt all data" and hit the "Add repository" button.

### What version of git-annex are you using? On what operating system?

  git-annex version 4.20130513-g5185533 on Android 4.2.2

### Please provide any additional information below.

Didn't find a .git/annex/debug.log
