Re: setting the port for a running wo app (more information)
Re: setting the port for a running wo app (more information)
- Subject: Re: setting the port for a running wo app (more information)
- From: Tarun Reddy <email@hidden>
- Date: Thu, 6 May 2004 12:08:35 -0600
To find out what ports to avoid, check out the file /etc/services.
Those are a list of all registered (and some unregistered) ports. On
any give machine most of these won't be in use, but it is fairly
comprehensive and a good general rule (in addition to the >1024 and
<65535 rule).
If you want to see if the port you want to use is in use, do this:
sudo lsof | grep <port number>
also cool, but generally not as useful:
sudo lsof | grep TCP
which shows you all open TCP connections on your machine.
if anything returns, then a process is using that port. The second
column is the actual PID for that process.
Tarun
On May 6, 2004, at 10:49 AM, Arturo Perez wrote:
John Spicer wrote:
By uncommenting this line "WOPort=55555"in the Properties file it now
always points to that port. That's great.
I wanted to have another number so I changed it to 362436 and saved,
rebuilt, etc. The app won't run, it always exits with status 1.
Hah! That's a funny one. Internet Protocol port numbers are stored
in an unsigned 16 bit quantity. So, please, try to keep your port
numbers below 65535 (or thereabouts). Also, ports below 1024 are
restricted use/privileged ports. So, please try to keep your ports
above 1024. Finally, many applications/daemon processes use various
ports for their own (probably nefarious) reasons. So, try to avoid
using any of those (e.g. telnet's port, ftp's port, http's port, etc).
I guess the upshot is that you can't just use any port you may feel
like. The port you choose must be somewhat carefully considered and
researched.
-arturo
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