Please help: Ensure the listed domains point to this nginx server and that it is accessible from the internet

Hello and thanks for the quick reply.

This is output of ifconfig:

eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 9001
inet 172.31.45.224 netmask 255.255.240.0 broadcast 172.31.47.255
inet6 fe80::8a0:a0ff:fe28:a4b8 prefixlen 64 scopeid 0x20
ether 0a:a0:a0:28:a4:b8 txqueuelen 1000 (Ethernet)
RX packets 171472 bytes 233086689 (233.0 MB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 25243 bytes 2976320 (2.9 MB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10
loop txqueuelen 1000 (Local Loopback)
RX packets 446 bytes 43888 (43.8 KB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 446 bytes 43888 (43.8 KB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0