Bug#863595: gnome-control-center: Can't save configuration if 'Use this connection only for resource on its network' is checked

[Jason Crain]

Control: forwarded -1 https://bugzilla.gnome.org/708500

On Sun, May 28, 2017 at 11:05:44PM -0400, Fabian Inostroza wrote:
> Manually configuring a network interface and checking the option 'Use this connection only for 
> resources on its network' doesn't allow to save it, the Apply button is grayed out.

The Apply button is grayed out whenever an invalid configuration is
detected.  In this case, the invalid configuration is because you both
specified a gateway through manual configuration and checked the 'only
for resources on its network' aka 'never default' box.  Instead, you
should use '0.0.0.0' or '::' for the gateway field if you really want to
use the 'never default' box.

In version 3.24 the dialog is changed to allow the gateway to be left
blank, which should make this less confusing in the future.