I would not recommend anybody to disable their firewall permanently if the router is connected to the internet. Once you read firewall logs, you realize how much malicious scanning exists from well known sources.
Remote >> 2x Silver Phantoms << Eth << Dialog UPNP << JRiver MediaCenter 24 - Ubuntu 18.04 x64 [VMWare] << File server - Windows 10 x64 [Supermicro X11SSH-LN4F, Xeon E3-1425 v5, 46 Tb, 16Gb DDR4 ECC] * Spark is only used to update firmware *