Tried with tcdump -n host printer_ip and opened up all the ports I could
see on the dump. Did not work out.
Ended up accepting all the traffic from the printer IP on the firewall.
Now it works.
Thanks
JP
On Fri, May 5, 2017 at 1:19 PM, Doug <dmcgarrett(a)optonline.net> wrote:
On 05/05/2017 01:16 PM, Tim wrote:
> François Patte wrote:
>
>> You have a list of ports and associated devices/protocols in
>>> /etc/serveces
>>>
>> Doug:
>
>> Tried the command from root in pclos and got permission denied. I
>> don't know what if any ports are in use for anything, but I figured I
>> might find out.
>>
> Yes, it dawned on me that it is a file, and I did open the file--a very
big one!
--doug
> I'm surprised that root couldn't read that. Or do you mean you tried to
> execute that? Rather than trying to read the contents of the
> file /etc/services
>
> I've always found netstat to be handy at seeing what services are trying
> to do on my computer. For example:
>
> netstat -antu
>
> If you drop the "n" option, you'll see the names of things, rather
than
> the numerical IP addresses and port numbers. For example:
>
> netstat -atu
>
> Stick a "p" option onto the list, and you'll see the actual program
> associated with the activity.
>
> Either way, you'll see a bunch of lines with some having "LISTEN" as
> their status. Those are services listening to those ports, whether or
> not anything is successfully communicating with them at the time.
>
> But before you blindly allow anything that's listening, do some research
> into the port numbers that you find listening. Just open the ones
> actually related to what you're trying to resolve.
>
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