I cannot confirm but it happen since I handed over admin access to a friend which I revoked later on when this issue popped up. I was under the impression that he was unknowingly pressing the " Restart " button. But it somehow happens that it is getting hung due to unknown reason. When I use restart command on terminal it won't work. I have to stop NodeBB and start it again. As @a_5mith mention, I tried to get a log only to get the terminal hung. Please help.
@meetdilip hey though it is hard to figure out the exact issue by the given symptoms but try running in dev mode by
./nodebb dev
and keep an eye on the log screen, it has the feature of restarting automatically after any error or failure. See the log for errors (in red) to figure out which plugin or script is causing the problem then you will be much closer to solving your problem.
Thanks @vatsal . 
I got this
[email protected]:~/home/nodebb# ./nodebb dev
Launching NodeBB in "development" mode.
To run the production build of NodeBB, please use "forever".
More Information: https://docs.nodebb.org/en/latest/running/index.html
info: NodeBB v0.5.1 Copyright (C) 2013-2014 NodeBB Inc.
info: This program comes with ABSOLUTELY NO WARRANTY.
info: This is free software, and you are welcome to redistribute it under certain conditions.
info:
info: Time: Wed Oct 15 2014 02:40:39 GMT+0000 (UTC)
info: Initializing NodeBB v0.5.1
info: * using configuration stored in: /root/home/nodebb/config.json
info: * using redis store at 127.0.0.1:6379
info: * using themes stored in: /root/home/nodebb/node_modules
info: Base Configuration OK.
Warning: Redis server does not require a password, but a password was supplied.
morgan deprecated morgan(options): use morgan("default", options) instead src/logger.js:128:22
morgan deprecated default format: use combined format src/logger.js:128:22
info: [notifications.init] Registering jobs.
info: [user.startJobs] Registering User Jobs
Warning: Redis server does not require a password, but a password was supplied.
Warning: Redis server does not require a password, but a password was supplied.
Warning: Redis server does not require a password, but a password was supplied.
info: [themes] Using theme nodebb-theme-lavender
info: [plugins] Initializing plugins system
info: Middlewares loaded.
warn: [plugins/nodebb-plugin-featured-threads] staticDir is deprecated, use staticDirs instead
info: [plugins] Found 1 CSS file(s) for plugin nodebb-plugin-featured-threads
info: [plugins] Found 1 LESS file(s) for plugin nodebb-plugin-youtube-lite
info: [plugins] Found 2 js file(s) for plugin nodebb-plugin-youtube-lite
info: [plugins] Found 1 LESS file(s) for plugin nodebb-plugin-registration-question
info: [plugins] Found 1 js file(s) for plugin nodebb-plugin-registration-question
info: [plugins] Found 2 LESS file(s) for plugin nodebb-plugin-poll
info: [plugins] Found 6 js file(s) for plugin nodebb-plugin-poll
info: [plugins] Found 1 LESS file(s) for plugin nodebb-plugin-mentions
info: [plugins] Found 2 js file(s) for plugin nodebb-plugin-mentions
info: [plugins] Found 1 CSS file(s) for plugin nodebb-plugin-youtube
info: [plugins] Found 1 LESS file(s) for plugin nodebb-plugin-markdown
info: [plugins] Found 2 js file(s) for plugin nodebb-plugin-markdown
info: [plugins] Found 1 CSS file(s) for plugin nodebb-widget-essentials
info: [plugins] Found 3 js file(s) for plugin nodebb-theme-lavender
info: [plugins] Loaded plugin: nodebb-plugin-featured-threads
info: [plugins] Loaded plugin: nodebb-plugin-youtube-lite
info: [plugins] Loaded plugin: nodebb-plugin-flipkart-iframe
info: [plugins] Loaded plugin: nodebb-plugin-registration-question
info: [plugins] Loaded plugin: nodebb-plugin-poll
info: [plugins] Loaded plugin: nodebb-plugin-mentions
info: [plugins] Loaded plugin: nodebb-plugin-flipkart
info: [plugins] Loaded plugin: nodebb-plugin-emailer-local
info: [plugins] Loaded plugin: nodebb-plugin-youtube
info: [plugins] Loaded plugin: nodebb-plugin-markdown
info: [plugins] Loaded plugin: nodebb-plugin-imgbed
info: [plugins] Loaded plugin: nodebb-plugin-imgur
info: [plugins] Loaded plugin: nodebb-plugin-dbsearch
info: [plugins] Loaded plugin: nodebb-widget-essentials
info: [plugins] Loaded plugin: nodebb-theme-lavender
info: [plugins] Sorting hooks to fire in priority sequence
warn: [plugins] The action:app.load hook is deprecated in favour of static:app.load, please notify the developers of the following plugins:
plugins replaced successfullyauth replaced successfullyLooks like there might be a problem with nodebb-plugin-featured-threads (which unfortunately is my plugin, I guess I haven't updated it to 0.5x yet)
Try uninstalling, are you still running into the same problem?
The address in use that's seen there is really annoying and I can't reproduce it. Running stop, restart etc does nothing. I have to log into digital Ocean and reboot the droplet. Think @Ted has similar issues.
could be that.
This happens to me on occasion - haven't tracked the plugin down responsible, as we aren't using featured threads.
If I spot it, I'll but sure to make a note of it here. It seems that the only way to correct the issue is a quick sudo init 6 to reboot the server, then restarting NodeBB after the fact.
@meetdilip I agree with @Ted your node process is hanged due to uncertain shutdown just restart your machine or do following
ps aux | grep -i node
will show th list of all process running with name "node" note the process id and kill each one
kill -9 process_id
you don't need to restart the server
@vatsal, to each his own.
I run my NodeBB in a non-traditional configuration, so I have a 15 second downtime at most once I execute the server reboot and then the relaunch of the platform. While there are other ways, this works for me; plus, it's simple to do from my mobile if necessary.
I must admit that I remember disabling the Featured Threads plugin before I gave access. I have disabled it and let it run. So far now downtime. Thanks you all. 
