I have Ubuntu 18.04 running on a virtualbox. chirpstack-application-server is running, but the web interface is inaccessible. From netstat, it appears that the service is not even binding the port 8080 on anything.
# This is the API and web-interface exposed to the end-user.
[application_server.external_api]
# ip:port to bind the (user facing) http server to (web-interface and REST / gRPC api)
bind="0.0.0.0:8080"
# ps aux | grep chirp
appserv+ 8858 0.0 0.6 745888 26036 ? Ssl 20:47 0:00 /usr/bin/chirpstack-application-server
root 8995 0.0 0.0 14428 1100 pts/0 S+ 20:56 0:00 grep --color=auto chirp
# netstat -tulpn
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp 0 0 0.0.0.0:111 0.0.0.0:* LISTEN 535/rpcbind
tcp 0 0 127.0.0.53:53 0.0.0.0:* LISTEN 533/systemd-resolve
tcp 0 0 127.0.0.1:631 0.0.0.0:* LISTEN 2899/cupsd
tcp 0 0 0.0.0.0:1883 0.0.0.0:* LISTEN 788/mosquitto
tcp6 0 0 :::111 :::* LISTEN 535/rpcbind
tcp6 0 0 ::1:631 :::* LISTEN 2899/cupsd
tcp6 0 0 :::1883 :::* LISTEN 788/mosquitto
udp 0 0 0.0.0.0:631 0.0.0.0:* 2901/cups-browsed
udp 0 0 0.0.0.0:711 0.0.0.0:* 535/rpcbind
udp 0 0 0.0.0.0:5353 0.0.0.0:* 732/avahi-daemon: r
udp 0 0 0.0.0.0:54630 0.0.0.0:* 732/avahi-daemon: r
udp 0 0 127.0.0.53:53 0.0.0.0:* 533/systemd-resolve
udp 0 0 0.0.0.0:68 0.0.0.0:* 854/dhclient
udp 0 0 0.0.0.0:111 0.0.0.0:* 535/rpcbind
udp6 0 0 :::711 :::* 535/rpcbind
udp6 0 0 :::5353 :::* 732/avahi-daemon: r
udp6 0 0 :::56803 :::* 732/avahi-daemon: r
udp6 0 0 :::111 :::* 535/rpcbind
# uname -a
Linux linus-VirtualBox 5.4.0-125-generic #141~18.04.1-Ubuntu SMP Thu Aug 11 20:15:56 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux