client error:
svn: E170013: Unable to connect to a repository at URL 'svn+ssh://git@120.25.127.191:22/diffusion/1'
svn: E210002: To better debug SSH connection problems, remove the -q option from 'ssh' in the [tunnels] section of your Subversion configuration file.
svn: E210002: Network connection closed unexpectedly

server log:
STDERR
fatal: your current branch 'master' does not have any commits yet
at [<phutil>/src/future/exec/ExecFuture.php:361]
arcanist(head=master, ref.master=2374403e8f80), phabricator(head=master, ref.master=e984f0eb76fe), phutil(head=master, ref.master=51c179b4c000)

#0 ExecFuture::resolvex() called at [<phutil>/src/filesystem/linesofalarge/LinesOfALargeExecFuture.php:108]
#1 LinesOfALargeExecFuture::readMore() called at [<phutil>/src/filesystem/linesofalarge/LinesOfALarge.php:199]
#2 LinesOfALarge::next() called at [<phutil>/src/filesystem/linesofalarge/LinesOfALarge.php:111]
#3 LinesOfALarge::rewind() called at [<phabricator>/src/applications/repository/daemon/PhabricatorGitGraphStream.php:33]
#4 PhabricatorGitGraphStream::__construct(PhabricatorRepository) called at [<phabricator>/src/applications/repository/engine/Phabrica... (1,169 more bytes) ... at [<phutil>/src/future/exec/ExecFuture.php:361]

[19-Jul-2016 11:15:32 PRC] arcanist(head=master, ref.master=2374403e8f80), phabricator(head=master, ref.master=e984f0eb76fe), phutil(head=master, ref.master=51c179b4c000)
[19-Jul-2016 11:15:32 PRC] #0 <#3> ExecFuture::resolvex() called at [<phabricator>/src/applications/repository/daemon/PhabricatorRepositoryPullLocalDaemon.php:393]
[19-Jul-2016 11:15:32 PRC] #1 phlog(PhutilProxyException) called at [<phabricator>/src/applications/repository/daemon/PhabricatorRepositoryPullLocalDaemon.php:400]
[19-Jul-2016 11:15:32 PRC] #2 PhabricatorRepositoryPullLocalDaemon::resolveUpdateFuture(PhabricatorRepository, ExecFuture, integer) called at [<phabricator>/src/applications/repository/daemon/PhabricatorRepositoryPullLocalDaemon.php:201]
[19-Jul-2016 11:15:32 PRC] #3 PhabricatorRepositoryPullLocalDaemon::run() called at [<phutil>/src/daemon/PhutilDaemon.php:184]
[19-Jul-2016 11:15:32 PRC] #4 PhutilDaemon::execute() called at [<phutil>/scripts/daemon/exec/exec_daemon.php:127]

why?