I\'m having problems accessing an SVN repository using TortoiseSVN 1.7.8.
The SVN repository is on a CentOS 6.3 box with openssh 5.3p1:81.el6
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I had the same issue, and I tried the regedit solution.
In my case the Default Host Name was not to blame, but the regedit showed me a space in the saved session name (%20).
Putty does not care about the session name when you open a connection from there, hence there was no error when connecting from Putty. But the session name is important in your svn+ssh:// url!
In my case the Putty session name was " server", and when I did a svn checkout I used "svn+ssh://server/srv/svn/repo", hence the error.