Strykar:

The Socket statistics utility, //ss//, will throw //Cannot open netlink socket: Protocol not supported// errors due to //CONFIG_NETLINK_DIAG// being unset in the kernel config.

root@apu:~# ss
Cannot open netlink socket: Protocol not supported
Cannot open netlink socket: Protocol not supported
Cannot open netlink socket: Protocol not supported
Cannot open netlink socket: Protocol not supported
Cannot open netlink socket: Protocol not supported
Cannot open netlink socket: Protocol not supported
Cannot open netlink socket: Protocol not supported
Netid State Recv-Q Send-Q Local Address:Port Peer Address:Port
u_str ESTAB 0 0 /var/run/ubus.sock 245 * 0
u_str ESTAB 0 0 * 473 * 0
u_str ESTAB 0 0 /var/run/ubus.sock 1363 * 0
u_str ESTAB 0 0 /var/run/ubus.sock 1515 * 0
u_str ESTAB 0 0 * 2486 * 0
u_str ESTAB 0 0 * 2514 * 0
u_str ESTAB 0 0 * 3197 * 0
u_str ESTAB 0 0 * 3366 * 0
u_str ESTAB 0 0 /var/run/ubus.sock 3367 * 0
u_str ESTAB 0 0 /var/run/ubus.sock 3520 * 0
u_str ESTAB 0 0 * 5924 * 0
u_str ESTAB 0 0 * 5925 * 0
u_str ESTAB 0 0 /var/run/ubus.sock 600750 * 0
u_str ESTAB 0 0 * 601742 * 0
u_dgr ESTAB 0 0 /dev/log 471 * 0
u_dgr ESTAB 0 0 * 1576 * 0
u_dgr ESTAB 0 0 * 1595 * 0
u_dgr ESTAB 0 0 * 2445 * 0
u_dgr ESTAB 0 0 * 2484 * 0
u_dgr ESTAB 0 0 * 3188 * 0
u_dgr ESTAB 0 0 * 5505 * 0
u_dgr ESTAB 0 0 * 5929 * 0
u_dgr ESTAB 0 0 * 565769 * 0
u_dgr ESTAB 0 0 * 601735 * 0
tcp ESTAB 0 0 217.107.210.186:56580 99.144.24.156:https
tcp ESTAB 0 0 192.168.1.10:https 192.168.1.100:45174
tcp ESTAB 0 0 217.107.210.186:56212 88.112.99.68:https
tcp ESTAB 0 0 192.168.1.10:https 192.168.1.100:45172
tcp ESTAB 0 0

I've confirmed this on //OpenWrt 18.06.5 (x86/64)// but the issue will exist on all platforms.
//@neheb// helped identify the real issue when I opened a bug for the //ss// package on Github and //@RussellSenior// recently saw the thread - openwrt/packages#8232

The suggested fix is:
--- a/target/linux/generic/config-4.19
+++ b/target/linux/generic/config-4.19
@@ -3164,7 +3164,7 @@ CONFIG_NETDEVICES=y

CONFIG_NETROM is not set