tcp port ESTABLISHED and LISTEN

--- PM2 report ----------------------------------------------------------------
Date                 : Mon Aug 31 2020 18:07:38 GMT+0800 (Taipei Standard Time)
===============================================================================
--- Daemon -------------------------------------------------
pm2d version         : 4.4.1
node version         : 12.16.3
node path            : /usr/local/bin/pm2
argv                 : /volume2/@appstore/Node.js_v12/usr/local/bin/node,/usr/local/lib/node_modules/pm2/lib/Daemon.js
argv0                : node
user                 : root
uid                  : 0
gid                  : 0
uptime               : 4322min
===============================================================================
--- CLI ----------------------------------------------------
local pm2            : 4.4.1
node version         : 12.16.3
node path            : /usr/local/bin/pm2
argv                 : /volume2/@appstore/Node.js_v12/usr/local/bin/node,/usr/local/bin/pm2,report
argv0                : node
user                 : root
uid                  : 0
gid                  : 0
===============================================================================
--- System info --------------------------------------------
arch                 : x64
platform             : linux
type                 : Linux
cpus                 : Intel(R) Celeron(R) CPU J3455 @ 1.50GHz
cpus nb              : 4
freemem              : 1121468416
totalmem             : 1916854272
home                 : /root
===============================================================================
--- PM2 list -----------------------------------------------
┌─────┬────────────┬─────────────┬─────────┬─────────┬──────────┬────────┬──────┬───────────┬──────────┬──────────┬──────────┬──────────┐
│ id  │ name       │ namespace   │ version │ mode    │ pid      │ uptime │ ↺    │ status    │ cpu      │ mem      │ user     │ watching │
├─────┼────────────┼─────────────┼─────────┼─────────┼──────────┼────────┼──────┼───────────┼──────────┼──────────┼──────────┼──────────┤
│ 0   │ tc_main    │ default     │ 1.0.0   │ fork    │ 32015    │ 15m    │ 1    │ online    │ 0.2%     │ 39.1mb   │ root     │ disabled │
└─────┴────────────┴─────────────┴─────────┴─────────┴──────────┴────────┴──────┴───────────┴──────────┴──────────┴──────────┴──────────┘
===============================================================================

What's going wrong?

my script doesn't work after move to new server..
how can I debug it?

How could we reproduce this issue?

I'm not sure the following is normal when I run lsof -i tcp:3000

sometimes

COMMAND   PID USER   FD   TYPE   DEVICE SIZE/OFF NODE NAME
node    32015 root   19u  IPv6 14877433      0t0  TCP 192.168.1.22:3000->192.168.1.41:49580 (ESTABLISHED)
node    32015 root   20u  IPv6 14877411      0t0  TCP *:3000 (LISTEN)

and sometimes shows

COMMAND   PID USER   FD   TYPE   DEVICE SIZE/OFF NODE NAME
node    32015 root   19u  IPv6 14877433      0t0  TCP 192.168.1.22:3000->192.168.1.41:49580 (ESTABLISHED)
pm2    32015 root   20u  IPv6 14877411      0t0  TCP *:3000 (LISTEN)

Supporting information

Start with the PM2 report and the two lsof -i tcp:3000 outputs, comparing PID 32015 and the ESTABLISHED/LISTEN entries. Done means establishing whether the differing command names are expected and documenting a reproducible diagnosis or next debugging step.