Hi, I'm back
I'm well polishing my Firewall Rules and finally, there's firewall services that I don't need anymore.
So, I go in the Firewall Objects, in the Services tab, and click on the edit buton, I'm able to delete the service...
There a yellow banner to show that Netserver made some adjust and an error message appear.
Expected feature: The page being refresh normally.
Occured feature: After deleting a service, the yellow banner appear, and a little message show that Shorewall is restarting. The page seem refreshing but afer few second... A little window appear: Error 404 Nethgui: 404 - Not found 1352715526.
With two butons reload page and try again.
How to reproduce:
Create a Firewall Service Object.
Return in the Firewall Service Object tab and delete the service.
Wait a little 
It's a bug, isn't it?