I'm going mad with this issue, that came out of all a sudden! Briefly, if I try to connect my svn server, I receive the following:
$ svn list svn://host svn: E170013: Unable to connect to a repository at URL 'svn://host' svn: E210005: No repository found in 'svn://host'
Of course svnserve is running on the default port (3690) and
telnet host 3690
is regularly working.
No firewalls, server nor client-side.
svn projects and repos are regularly working locally.