subversion - svnsync synchronize hangs - how to debug?

Hi:

I’ve been trying to get an SVN repository to synchronize to a target server. When I run the
svnsync synchronize [target-http-url] [target-svn+ssh-url] I get the following output:

    Transmitting file data .

It just hangs there. I managed to get some logging on the svnserve source side switched on and the last entry I see in the log is:

    32272 2014-12-01T18:28:35.638273Z - [uid] [repo-name] replay / r108

Would love some suggestions about how to debug this. I've checked out revisions 107, 108 and 109 successfully.

Thanks!
Received on 2014-12-01 20:31:01 CET