In T7471#118340, @harpyham wrote:

Login as webuser , run svn checkout command and accept the certificate permanently .

like this:
#cd /tmp
#su wwwrun -s /bin/sh
#svn co https://ip/svn/pro/xxxxxx
... select permanently ...
#exit

Refresh phabricator's web page.

In T7471#100638, @zzh wrote:

And the Subversion server is install over other machine, I'm not the administrator