Can't connect with TortoiseSVN

I'm trying to set up a non-anon SVN repo, and it's mostly working, except I
cannot access it using TortoiseSVN unless I go through SSH (putty+plink). I need
non-SSH access to work so a client may check things in and out.

I *can* login and access with svn command line from a Linux machine and with svn
command line under cygwin.

I'm not connecting through Apache - the URL I use is:

svn://my.host.net/path/to/my/repo

The server is running (svnserve -d) on my shell account with my hosting
provider. I've got users set up, but I never get the login prompt when using
TortoiseSVN.

TSVN appears to connect, but when I try to expand the root folder of my repo, I
get the following message: "No connection could be made because the target
machine actively refused it."

Any suggestions?

thanks,
Sean

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