The site is using a non-standard CA. Wormly has a nice series of tests for these things, see here for an example: https://www.wormly.com/test_ssl/h/presale.ev

The site is using a non-standard CA. Wormly has a nice series of tests for these things, see here for an example: https://www.wormly.com/test_ssl/h/presale.events.ccc.de/i/213.73.91.79/p/443 https://www.wormly.com/test_ssl/h/presale.events.ccc.de/i/21...