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As you can see, the way the virtual host is setup will cause the same name to be resolved on the outside as well as the inside. On the outside the VIP will never change, so that's the A record. Where as on the inside the host may so that's the CNAME.
So, in short, the 2 things you need to change to drop a new PowerSchool server in will be:
- The inside IP for the virtual IP on the fortigate
- The inside DNS CNAME for pscopperisd