I am trying to run the simplest of node servers on a Digital Ocean server. I developed and tested the code using port 8080 without problems. However, now I want to use port 80 so that I do not need to specify the port when navigating to the ip address of my server (so it will default).
When I change the port to 80 and run the app as sudo I get Error: listen EADDRINUSE even when I do not have any other applications running on the server (at all). Is there a way to clear port 80 for use?
I checked here How to fix Error: listen EADDRINUSE while using nodejs? but none of those suggestions worked. This is definitely the only program on my server.
There are no other processes in my code that are listening on any port. There is actually no app running on my server at all so I do not understand how the port could be in use. Thanks for any help
Edit. Here is what running netstat returns:
Active Internet connections (w/o servers)
Proto Recv-Q Send-Q Local Address Foreign Address State
tcp 0 0 192.241.228.76:ssh mobile-166-137-17:62351 ESTABLISHED
tcp 0 0 192.241.228.76:ssh 199-241-200-214.P:41732 ESTABLISHED
tcp 0 0 192.241.228.76:9090 199-241-200-214.P:38480 ESTABLISHED
tcp 0 0 192.241.228.76:ssh mobile-166-137-17:45329 ESTABLISHED
tcp 0 0 192.241.228.76:ssh 199-241-200-214.P:47247 ESTABLISHED
tcp 0 308 192.241.228.76:ssh 199-241-200-214.P:44441 ESTABLISHED
Active UNIX domain sockets (w/o servers)
Proto RefCnt Flags Type State I-Node Path
unix 8 [ ] DGRAM 7710 /dev/log
unix 3 [ ] STREAM CONNECTED 1113212
unix 3 [ ] STREAM CONNECTED 7405 @/com/ubuntu/upstart
unix 3 [ ] STREAM CONNECTED 7394
unix 3 [ ] STREAM CONNECTED 1113211
unix 2 [ ] DGRAM 9255
unix 3 [ ] STREAM CONNECTED 7681
unix 3 [ ] STREAM CONNECTED 7617 /var/run/dbus/system_bus_socket
unix 3 [ ] STREAM CONNECTED 1113404
unix 3 [ ] STREAM CONNECTED 1113682
unix 2 [ ] DGRAM 1113070
unix 2 [ ] DGRAM 1113287
unix 3 [ ] STREAM CONNECTED 1113683 /var/run/dbus/system_bus_socket
unix 3 [ ] STREAM CONNECTED 1113675
unix 3 [ ] STREAM CONNECTED 7601
unix 3 [ ] STREAM CONNECTED 7602
unix 3 [ ] STREAM CONNECTED 7631 @/com/ubuntu/upstart
unix 3 [ ] STREAM CONNECTED 1114471
unix 2 [ ] DGRAM 1111881
unix 3 [ ] STREAM CONNECTED 1113411
unix 3 [ ] STREAM CONNECTED 1113219 /var/run/dbus/system_bus_socket
unix 3 [ ] STREAM CONNECTED 1113218
unix 3 [ ] STREAM CONNECTED 1112008
unix 3 [ ] STREAM CONNECTED 8858 @/com/ubuntu/upstart
unix 3 [ ] DGRAM 7439
unix 3 [ ] STREAM CONNECTED 7682 /var/run/dbus/system_bus_socket
unix 3 [ ] STREAM CONNECTED 8836
unix 3 [ ] STREAM CONNECTED 1114472
unix 3 [ ] DGRAM 7438
unix 3 [ ] STREAM CONNECTED 1113412 /var/run/dbus/system_bus_socket
unix 3 [ ] STREAM CONNECTED 1113676
unix 2 [ ] DGRAM 1113552
unix 3 [ ] STREAM CONNECTED 1113405
unix 3 [ ] STREAM CONNECTED 7616
unix 3 [ ] STREAM CONNECTED 7594
unix 3 [ ] STREAM CONNECTED 1112002
unix 2 [ ] DGRAM 1114349
unix 3 [ ] STREAM CONNECTED 1112001
unix 3 [ ] STREAM CONNECTED 1112009 /var/run/dbus/system_bus_socket
And here is what running ps -ax returns
PID TTY STAT TIME COMMAND
1 ? Ss 0:05 /sbin/init
2 ? S 0:00 [kthreadd]
3 ? S 0:01 [ksoftirqd/0]
5 ? S< 0:00 [kworker/0:0H]
7 ? S 0:09 [rcu_sched]
8 ? S 0:00 [rcu_bh]
9 ? S 0:00 [migration/0]
10 ? S 0:14 [watchdog/0]
11 ? S< 0:00 [khelper]
12 ? S 0:00 [kdevtmpfs]
13 ? S< 0:00 [netns]
14 ? S< 0:00 [writeback]
15 ? S< 0:00 [kintegrityd]
16 ? S< 0:00 [bioset]
17 ? S< 0:00 [kworker/u3:0]
18 ? S< 0:00 [kblockd]
19 ? S< 0:00 [ata_sff]
20 ? S 0:00 [khubd]
21 ? S< 0:00 [md]
22 ? S< 0:00 [devfreq_wq]
23 ? S 2:16 [kworker/0:1]
24 ? S 0:00 [khungtaskd]
25 ? S 0:00 [kswapd0]
26 ? SN 0:00 [ksmd]
27 ? S 0:00 [fsnotify_mark]
28 ? S 0:00 [ecryptfs-kthrea]
29 ? S< 0:00 [crypto]
41 ? S< 0:00 [kthrotld]
44 ? S 0:00 [scsi_eh_0]
45 ? S 0:00 [scsi_eh_1]
65 ? S< 0:00 [deferwq]
66 ? S< 0:00 [charger_manager]
119 ? S 0:04 [jbd2/vda-8]
120 ? S< 0:00 [ext4-rsv-conver]
254 ? S 0:00 upstart-udev-bridge --daemon
259 ? Ss 0:00 /lib/systemd/systemd-udevd --daemon
321 ? Ss 0:00 dbus-daemon --system --fork
351 ? Ss 0:00 /lib/systemd/systemd-logind
354 ? Ssl 0:19 rsyslogd
363 ? S 0:00 upstart-file-bridge --daemon
367 ? S< 0:00 [kpsmoused]
371 ? S 0:00 [kworker/0:2]
463 ? S< 0:00 [kvm-irqfd-clean]
730 ? S 0:00 upstart-socket-bridge --daemon
773 tty4 Ss+ 0:00 /sbin/getty -8 38400 tty4
777 tty5 Ss+ 0:00 /sbin/getty -8 38400 tty5
783 tty2 Ss+ 0:00 /sbin/getty -8 38400 tty2
784 tty3 Ss+ 0:00 /sbin/getty -8 38400 tty3
786 tty6 Ss+ 0:00 /sbin/getty -8 38400 tty6
811 ? Ss 0:12 /usr/sbin/sshd -D
817 ? Ss 0:00 acpid -c /etc/acpi/events -s /var/run/acpid.socket
819 ? Ss 0:02 cron
821 ? Ss 0:00 atd
898 tty1 Ss+ 0:00 /sbin/getty -8 38400 tty1
933 ? S< 0:00 [kworker/u3:1]
938 ? S 0:00 [kauditd]
24995 ? S 0:00 [kworker/u2:1]
29226 ? S 0:07 [kworker/u2:0]
29542 ? Ss 0:00 SCREEN
29543 pts/2 Ss+ 0:00 /bin/bash
30826 pts/6 Ss+ 0:00 -bash
30892 ? Sl 0:00 nodejs index.js
30962 pts/1 R+ 0:00 ps -ax
