A client of mine was using TortoiseSVN and was having difficulty committing a change to the repository. Below is a similar error message to the one he was getting. svn: Commit failed (details follow): svn: MKACTIVITY of ‘/foobar/!svn/act/1f177b34-1601-0010-84ad-c180bd3a7ab5′: 403 Forbidden (http:/svn.foobar.com) The issue is that Windows is case INSENSITIVE but SVN is case SENSITIVE….