One way to simplify the URL in TortoiseSVN is to set the user inside the PuTTY session. For this you have to load your already defined session SvnConnection in PuTTY and in the Connection tab set Auto login user to the user name, e.g. svnuser. Save your PuTTY session as before and try the following URL inside TortoiseSVN:
svn+ssh://SvnConnection/repos
This time we only provide the PuTTY session SvnConnection to the SSH client TortoiseSVN uses (TortoisePlink.exe). This client will check the session for all necessary details.
Many people like to use Pageant for storing all their keys. Because a PuTTY session is capable of storing a key, you don't always need Pageant. But imagine you want to store keys for several different servers; in that case you would have to edit the PuTTY session over and over again, depending on the server you are trying to connect with. In this situation Pageant makes perfect sense, because when PuTTY, Plink, TortoisePlink or any other PuTTY-based tool is trying to connect to an SSH server, it checks all private keys that Pageant holds to initiate the connection.
For this task, simply run Pageant and add the private key. It should be the same private key you defined in the PuTTY session above. If you use Pageant for private key storage, you can delete the reference to the private key file in your saved PuTTY session. You can add more keys for other servers, or other users of course.
If you don't want to repeat this procedure after every reboot of your client, you should place Pageant in the auto-start group of your Windows installation. You can append the keys with complete paths as command line arguments to Pageant.exe
The last way to connect to an SSH server is simply by using this URL inside TortoiseSVN:
svn+ssh://svnuser@100.101.102.103/repos svn+ssh://svnuser@mydomain.com/repos
As you can see, we don't use a saved PuTTY session but an IP address (or domain name) as the connection target. We also supply the user, but you might ask how the private key file will be found. Because TortoisePlink.exe is just a modified version of the standard Plink tool from the PuTTY suite, TortoiseSVN will also try all the keys stored in Pageant.