Server 2016 upgrade prep

[badders]

I'm looking at installing a 2016 DC in our network but when checking that everything is running smoothly before proceeding I'm seeing lots of schannel 36886 warnings on the current DC's (2012r2). We don't have an enterprise CA, can I ignore them or do I need to investigate further and what would be the best way to do this.

[JackCPickup]

You can ignore it or set up an internal CA for your servers.