title: git svn dcommit to sourceforge fails but it works via svn directly
body: <p>I'm working on a Open Source project on SourceForge that uses Subversion. A few days ago I did a <code>git svn clone</code> and started tracking my changes using Git.</p>
  
  <p>After a while I tried to <code>dcommit</code> my changes back upstream. But that failed with the following error:</p>
  
  <p><code>Autorisierung schlug fehl: MKACTIVITY von »/svnroot/housebot/!svn/act/b8dbd0ff-f224-4899-b6fe-06a514fa2dbf«: Autorisierung schlug fehl: Could not authenticate to server: rejected Basic challenge (https://housebot.svn.sourceforge.net) at /sw/lib/git/git-svn line 3649
  </code></p>
  
  <p>(Please ignore the german. It says something like "Authorization failed".). So I thought that my SSH key was setup incorrectly, but when I try to commit changes through svn it works perfectly fine.</p>
  
  <p>So I'm at a loss to what's actually going wrong here. I would have assumed that it would either work in both svn and git svn or not at all.</p>