DirectAccess 2012 R2 - add 2nd node to single node cluster without down time

Hi,

 We have a single DA server setup as a 1 node cluster. The server uses a NetScaler as a load balancer. We want to add another node into the cluster. Currently we have Windows 10 clients connected to the single node cluster. If we add another server into the mix, will it break DA for existing client connections?

Thanks

IT Support/Everything