DirectAccess, NCA change effect on clients.

DirectAccess on Windows Server 2016 installed. DA is populated directly to Internet.

We have:
NLA: Load Balancer (Great!)
NCA: 2 different Windows Servers 2008 with IIS and certificate installed <- problem

Challenge:
- Windows Servers 2008 must be replaced
- Connection distiruption should be very minimal or not exist

We can add another, new instanse in NCA, and remove old ones later (2 times GPO Change)

Question: Will there be distiruption from a client side?

MCSE Mobility 2018. Expert on SCCM, Windows 10, ALOVPN, MBAM.