Re: VCSA install - Unable to save IP settings

It's likely a known bug which you are facing.

From VMware vCenter Server 7.0 Update 1 Release Notes

Deployment of a vCenter Server Appliance by using port 5480 at stage 2 fails with unable to save IP settings error

If you use https://appliance-IP-address-or-FQDN:5480 in a Web browser, go to the vCenter Server Appliance Management Interface for stage 2 of a newly deployed vCenter Server Appliance, and you configure a static IP or try to change the IP configuration, you see an error such as
Unable to save IP settings. 

Workaround: None.

André