Conectando-se ao endereço IP do localhost na rede wifi Arch Linux

Question

Eu criei uma rede de tethering de Wi-Fi pelo Android e conectei-a ao Arch Linux. No Ubuntu, eu usei ifconfig para descobrir o endereço IP local por rede wifi. Eu corro servidor do nó na porta 4200.

Quando executo hostname --ip-address no Arch Linux. Eu recebo 192.168.43.213 . Mas 192.168.43.213:4200 está inacessível. Aqui está a saída de ip addr .

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: enp2s0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc fq_codel state DOWN group default qlen 1000
    link/ether 4c:cc:6a:09:12:b9 brd ff:ff:ff:ff:ff:ff
3: wlp0s20f0u9: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
    link/ether 18:d6:c7:13:c1:f3 brd ff:ff:ff:ff:ff:ff
    inet 192.168.43.213/24 brd 192.168.43.255 scope global wlp0s20f0u9
       valid_lft forever preferred_lft forever
    inet6 fe80::cb:fcd1:c31d:ddef/64 scope link 
       valid_lft forever preferred_lft forever