Here is the syntax for the SVN server's URL:

svn+ssh://user@votre_adresse_IP/srv/votre_disque/svn/nom_du_repository/

For instance, if your hostname is 'harry', your repository is 'gandi', and your username is 'bob', the URL will be:

svn+ssh://bob@92.243.X.X/srv/d_harry/svn/gandi/

It is sometimes necessary for Subversion to open several SSH connections for the same action. There is no real solution to fix this besides creating an SSH key.