Solution for "svn: Server sent unexpected return value (403 Forbidden) in response to MKACTIVITY"
Problem:
$ svn commit -m 'xxx'
svn: Commit failed (details follow):
svn: Server sent unexpected return value (403 Forbidden) in response to MKACTIVITY request for '/svn/xxx
The solution is to specify the username:
$ svn commit -m 'xxx' --username <login>