Hello Håkon,
At the current version the center endpoint cannot be changed from the UI.
It is very important to choose the correct IP address when you do the initial installation and run the installation wizard.
The easiest way to modify it, is just to uninstall the center and re-install it, and run the wizard again.
After you re-install the center, you can modify the file GatewayConfiguration.json in the
gateway installation directory to point to the correct address (last section, under "ServiceProxyConfiguration" there is IP and port).
It is important to first fix it in the center machine because as soon the gateway will manage to connect to the center, it will re-download the configuration from the center, so if you just fix it in the file, the changes will revert back to the wrong ones.
I will send the feedback to our developers to find way to modify the center endpoint address from the UI.
Ophir.