Stealth mode in Norton

I have a question. I recently installed a new modem/router and I've been having issues with some online applications. After some troubleshooting they suggested that i removed stealth so that the ports would be open . so my question is: is there an stealth mode present in Norton 360. And how do I disable it?

 

P.S. maybe it is listed under a different name in the dutch version any help would be greatly appreciated.

 

Thanks,