Adicione um
Satisfy Any
Directiva antes da
Required valid-user
Correto, deve ser:
<Location /project1>
DAV svn
SVNPath /var/svn/project1
AuthType Basic
AuthName "bla"
AuthUserFile /etc/apache2/svn.project1.passwd
AuthzSVNAccessFile /etc/apache2/svn.project1.authz
Satisfy Any
Require valid-user
</Location>