I am running several sites on a with Linode 768 server. I am getting an unable to connect message on my web browser. Can someone give me some ideas as to what might be causing the issues and ideas on what to look for to diagnose the issues.

Thanks

Firewall(logs), webserver logs (unless you get a timeout), messages/syslog, stuff like that... And of course check with a service like downornot, to see if it's not a problem on your end.

You're sure the services are enabled? You can check with netstat if they're listening.

The ip address and domain would be handy too then the lovely folks on this forum could do some tests.

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This is the domain. Tests would be appreciated.
www.nygiantstweets.com

The site loads fine for me.

Can you locally even ping the site? Does it resolve the IP? Did you try a different browser, and/or PC?

It's probably somewhere in your local network, since the site works fine from here.

Loads fine for me.

Yep works fine here try running mtr and posting the results (see http://library.linode.com/linux-tools/mtr)

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I have since restarted nginx. When I get the issue again I will see if I can run some of the tests you recommend and then paste the output to the board. Not sure if I can leave the site down to wait for a response from the board.
Thanks

Definitely has something to do with nginx shutting down for some reason. The nginx daemon was stopped. I am not sure what is causing this. Any suggestions on how to debug this.
basically logged into my server then did ps axf | grep nginx
to see that there was no nginx running. Then restarted now nginx is running.

Check your nginx error logs normally in /var/log/nginx/error.log

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This time something is killing both my nginx and monit processes. Could it be a memory issue when the server spikes here is my free-m
process printout
total used free shared buffers cached
Mem: 747 452 294 0 9 92
-/+ buffers/cache: 350 397
Swap: 255 1 254

do I need to upgrade?

please let me know if there are any other commands that I should run to print out here. I don't think it is a networking issue. I think this
happens when googlebot visits my sites but not absolutely sure. Any help would be appreciated.


I have installed monit to restart nginx if it goes down for the time being will see if that works.
Both my nginx and monit are going down here is a current printout of my top command.

Mem: 765280k total, 693668k used, 71612k free, 6516k buffers
Swap: 262140k total, 3544k used, 258596k free, 157136k cached

PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
23162 root 20 0 9200 5468 1928 S 0 0.7 0:01.61 ruby
23241 nobody 20 0 111m 54m 4120 S 0 7.3 0:03.02 ruby
23269 nobody 20 0 125m 68m 4188 S 0 9.1 0:04.95 ruby
23272 nobody 20 0 111m 55m 4604 S 0 7.4 0:14.86 ruby
23289 nobody 20 0 112m 55m 3736 S 0 7.4 0:01.84 ruby
23317 nobody 20 0 108m 52m 3956 S 0 7.0 0:01.85 ruby
23383 nobody 20 0 114m 59m 4584 S 0 7.9 0:16.73 ruby
23415 nobody 20 0 106m 50m 4604 S 0 6.8 0:13.90 ruby
23432 nobody 20 0 109m 52m 4000 S 0 7.0 0:01.35 ruby
1 root 20 0 2732 512 260 S 0 0.1 0:02.55 init
2 root 20 0 0 0 0 S 0 0.0 0:00.00 kthreadd
3 root 20 0 0 0 0 S 0 0.0 0:13.78 ksoftirqd/0
4 root 20 0 0 0 0 S 0 0.0 0:14.00 kworker/0:0
5 root 20 0 0 0 0 S 0 0.0 0:00.07 kworker/u:0
6 root RT 0 0 0 0 S 0 0.0 0:00.00 migration/0
7 root RT 0 0 0 0 S 0 0.0 0:00.00 migration/1
8 root 20 0 0 0 0 S 0 0.0 0:00.00 kworker/1:0
9 root 20 0 0 0 0 S 0 0.0 0:04.29 ksoftirqd/1
10 root RT 0 0 0 0 S 0 0.0 0:00.00 migration/2
11 root 20 0 0 0 0 S 0 0.0 0:00.00 kworker/2:0
12 root 20 0 0 0 0 S 0 0.0 0:03.92 ksoftirqd/2
13 root RT 0 0 0 0 S 0 0.0 0:00.00 migration/3
14 root 20 0 0 0 0 S 0 0.0 0:00.00 kworker/3:0
15 root 20 0 0 0 0 S 0 0.0 0:03.76 ksoftirqd/3
16 root 0 -20 0 0 0 S 0 0.0 0:00.00 cpuset
17 root 0 -20 0 0 0 S 0 0.0 0:00.00 khelper
18 root 20 0 0 0 0 S 0 0.0 0:00.00 kworker/u:1
22 root 20 0 0 0 0 S 0 0.0 0:00.00 xenwatch
23 root 20 0 0 0 0 S 0 0.0 0:00.00 xenbus
149 root 20 0 0 0 0 S 0 0.0 0:01.03 sync_supers