Cannot kill python program on port 8000 causing Tryton server socket.error - sockets

Question

I have been getting more deeply involved in python for scientific computing (as a hobby) over the last 2 years and as I also have a medical degree, I really, really want to get a copy of GNU Health running on my new Kubuntu 15.10 OS so I can learn how it all works and play around with it! I followed the instructions to install it on this page: https://en.wikibooks.org/wiki/GNU_Health/Installation
I got pretty much to the end but when I try to launch the tryton server with ./trytond I get this error message:
[Thu Oct 29 10:25:02 2015] INFO:trytond.server:using /home/gnuhealth/gnuhealth/tryton/server/config/trytond.conf as configuration file
[Thu Oct 29 10:25:02 2015] INFO:trytond.server:initialising distributed objects services
Traceback (most recent call last):
File "./trytond", line 80, in <module>
trytond.server.TrytonServer(options).run()
File "/home/gnuhealth/gnuhealth/tryton/server/trytond-3.4.6/trytond/server.py", line 71, in run
self.start_servers()
File "/home/gnuhealth/gnuhealth/tryton/server/trytond-3.4.6/trytond/server.py", line 178, in start_servers
self.jsonrpcd.append(JSONRPCDaemon(hostname, port, ssl))
File "/home/gnuhealth/gnuhealth/tryton/server/trytond-3.4.6/trytond/protocols/jsonrpc.py", line 382, in __init__
self.server = server_class((interface, port), handler_class, 0)
File "/home/gnuhealth/gnuhealth/tryton/server/trytond-3.4.6/trytond/protocols/jsonrpc.py", line 317, in __init__
bind_and_activate)
File "/usr/lib/python2.7/SocketServer.py", line 420, in __init__
self.server_bind()
File "/home/gnuhealth/gnuhealth/tryton/server/trytond-3.4.6/trytond/protocols/jsonrpc.py", line 346, in server_bind
SimpleJSONRPCServer.server_bind(self)
File "/usr/lib/python2.7/SocketServer.py", line 434, in server_bind
self.socket.bind(self.server_address)
File "/usr/lib/python2.7/socket.py", line 228, in meth
return getattr(self._sock,name)(*args)
socket.error: [Errno 98] Address already in use
On further investigation with sudo netstat -pant | grep 8000 I get
tcp 0 0 127.0.0.1:8000 0.0.0.0:* LISTEN 2516/python
I have tried to kill this python program running on port 8000 every different way I could find but it keeps coming back with a new number in front i.e.
tcp 0 0 127.0.0.1:8000 0.0.0.0:* LISTEN 916/python
I kill it then...
tcp 0 0 127.0.0.1:8000 0.0.0.0:* LISTEN some_other_number etc../python
Can someone please explain what is going on with this python program keeping on restarting and how I fix this one little problem getting in the way of me starting the server!?

Answer 1

I was looking at the install instructions you mentioned.
Look at this section:
Activate Network Devices for the JSON-RPC Protocol
The Tryton GNU Health server listens to localhost at port 8000, not allowing direct connections from other workstations.
editconf
You can edit the parameter listen in the [jsonrpc] section , to activate the network device so workstations in your net can connect. For example, the following block
[jsonrpc]
listen = *:8000
will allow to connect to the server in the different devices of your system.
Check if you can change the value of the port and see if it works.
Use a port number that is unused. Use this command to check whether the port number is available. It has to be greater than 1024.
netstat -nlp | grep <self-chosen-hopefully-unused-port-number>
Hope this helps.