I recently ran into this error part way through when checking out a large repository from subversion:
svn: REPORT of '/svn/!svn/vcc/default': Could not read chunk size: connection was closed by server (http://some.hostname.com)
Since it was a rather large repository, I’m guessing it is the size of this checkout process causing the problem. Fortunately, the fix is easy. You just have to go into the directory with the partial checkout and run ‘svn up’ In my case, I had to run it two more times to get the entire repository.