It would appear that the torrent client that you're using does have some issue with SSL connections. Your best bet is to check the setings in your torrent client, and force it to accept the tracker's SSL cert. Also, depending on what OS you're running and whether or not you can install apps, it may be worth while to try qBitTorrent. It's available on most platforms, yet is quite simple to work with.

That mentioned "warning" is rather an alert sign, only. It is visible to staff only. It isn't the red triangle warning, which if you see it, would mean your account is blocked from browsing torrents and connecting to the tracker.