Server 2008 r2 Website Connection Problems

[Auno94]

Hello There,

 

so I have a really interesting problem with my pack of older Windows Server 2008 r2 TS:
We can not connect to some websites via https (http, if no https forced, works fine) like yahoo; tk.de; datev.de etc.

I don't know why this happens (updates are fine, across 5 different systems, no issues on local computers or other virtual server that run 2016).

 

They lay on different physical server, no Deep packet inspection, all of them are patch wise on a stand between this month and january (yes, yes I know).

The TLS handshake works fine, but the connection drops when the website files should be coming in.

All Websites that I am aware of are signed by digicert.

 

Do you guys have an idea, because this drives me nuts for a week or so

[Auno94]

The interesting thing is that I get TLS 1.2 with google (172.217.22.36) but only TLS 1.0 with yahoo (87.248.98.8) and the client hello.

It should be TLSv1.2 because I set the tls_min var. in firefox about:config to the right value "3"