The IP Settings app always takes the last defined external interface and assigns it to the GATEWAYDEV variable in /etc/sysconfig/network. This results in disconnecting the server from the Internet if the last external interface is not connected to the Internet. In this case, the admin has to manually edit /etc/sysconfig/network in order to set the correct gateway device. I think it would be better to have an option in the IP Settings app to define the "default gateway device" in case there are more than one external interface.
In IP Settings
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