I keep getting "The certificate for this server is invalid" for all SSL web sites.
Ever since upgrading to MacOS Sierra I get certificate errors on my late 2013 Mac Pro. It will work fine right after a reboot, but then it will start refusing to open any web sites that use SSL. This happens until I reboot, then it's fine for a bit.
I thought this was some sort of problem caused by applying update after update to the MP, so I completely erased the hard drive and reinstalled Sierra fresh. And now the certificate problem is back.
Anyone else having issues like this? Anyone know of a fix?
Mac Pro, macOS Sierra (10.12)