New Bigfix reusing hostname and IP

Hi, I am reinstalling the BES Server while keeping the same hostname and IP address (I am not reusing the original masthead because the license.pvk password was lost).
Will I need to replace the masthead on all client machines, or will simply restarting the clients be enough?

Yes, you will need to replace the masthead on the Client machines given that you’ll not be re-using the original masthead on the Server. Even if the hostname/IP of the Root Server is the same, the certificate/PKI will be different if you’re generating a new masthead.