When trying to log in, I kept getting an "Invalid Port Number" from putty.
The message comes up if the user has already made an SSH connection using the Putty saved session. To avoid the error, you need to use a "Saved Session" that has never been used before.
If that doesn't work:
- leave the SSH client field blank (which makes TortoiseSVN use TortoisePlink)
- when you enter the URL of the repository, use the name of the saved session. For example, if your session name is MyConnection, use MyConnection instead of e.g. www.example.com