This is probably because your repository URL is invalid (maybe you used https:\\ instead of https://?). In a command prompt, try
svn list your repository URL
to check if your repository URL is valid or not.
i was recieving the same error whilst running Win 8 (64 bit) with the tortoise client installed.
however when i changed machine to windows 7 (32 bit version) of QV Client 11.2 and installing the tortoise client it worked.
so either the problem resides in the different bit versions or this is a problem with Win 8.
i believe the latter, as win 8 also had problems with other VPN connections that work just fine on the win 7 platform.