Windows Server 2008 R2 Activation Error 0x80072f8f Work -

nslookup activation.sls.microsoft.com telnet activation.sls.microsoft.com 443 If telnet fails, open outbound to *.microsoft.com .

For proxy environments:

date MM-DD-YYYY time HH:MM:SS Windows Server 2008 R2 (RTM or SP1 without the latest updates) lacks modern root certificates. Microsoft changed its CA chain multiple times since 2008 R2’s end-of-support (January 2020). windows server 2008 r2 activation error 0x80072f8f work