Certificate error on update to 2.12.1 (solved)(tu) (4 replies)

Hi,

I tried to start the one-click update from 2.12.0 to 2.12.1 and got a certificate error (screenshot attached).
My Piwik site is running on a Windows 2008 R2 Server (IIS 7.5) with PHP 5.5.21 and is SSL secured, too.

Does anyone have an idea?

Thanks, Klaus