Yes, you can do it via your browser. When you open your VisualSVN Server URL using HTTPS, if your VisualSVN Server has self-signed certificate, browser will warn you about it. Browser will ask: would you add this certificate to the security exception list? If you will accept it, browser will add this certificate to the exception list and next time you visit this server you will connect without certificate confirmation.
As also you can export certificate via browser. For example, when you're trying to connect to the server with self-signed certificate using Firefox, it will show you "This Connection is Untrusted" message. You can export certificate with the following steps:
- Choose "I understand the risk"
- Click "Add Exception" button. "Add Security Exception" window will be open.
- After a few seconds "view" button will be active, click it. "Certificate viewer" window will be open.
- Choose "Details" tab and then click "export".
- Firefox will offer you to save certificate on your local disk. You'll be able to choose the format of the certificate before saving. After you get the certificate you'll be able to import it everywhere you want.
As you have noticed, VisualSVN Server Manager doesn't support export of the certificates. But this function will be supported in one of the next releases.
Good luck!