Start iManager and click through the warnings about a DNS name mismatch.
In the Login dialog box, type the Admin username and password, type the newmasterip address in the Tree field, then click Login.
Click NetIQ Certificate Server > Repair Default Certificates.
In Create Server Certificate > Step 1 of 3, browse to and select the server object for the server you are changing.
Click OK > Next.
In Step 2 of 3, click Next.
Click Finish, then close the dialog box.