Fwd: Re: cups

[Craig White]

On Sun, 2007-03-11 at 14:57 -0700, Michael Havens wrote:
> Thanks for teaching me about  'netstat -an'
> A portion of the listing is:
> Active Internet connections (servers and established)
> Proto Recv-Q Send-Q Local Address           Foreign Address         State
> tcp        0      0 127.0.0.1:2368          0.0.0.0:*               LISTEN
> tcp        0      0 0.0.0.0:515             0.0.0.0:*               LISTEN
> tcp        0      0 127.0.0.1:3338          0.0.0.0:*               LISTEN
> tcp        0      0 0.0.0.0:139             0.0.0.0:*               LISTEN
> tcp        0      0 0.0.0.0:20012           0.0.0.0:*               LISTEN
> tcp        0      0 0.0.0.0:631             0.0.0.0:*               LISTEN
> tcp        0      0 0.0.0.0:445             0.0.0.0:*               LISTEN
>  also in the list were state:established & time_wait
> if by 'matching up' you meant ' find duplicate ':x' ports (is that what it 
> means) I figured  that that is what 'established' meant. So I entered 
> http://localhost:631 and it responded:
> 	the requested resource was not found on this server
> but 631s State is 'listen' so I entered one that is listed as  
> 'established' (2368). and the screen would go blank and a progress monitor 
> would appear and zoom up to 100%. Then the b/s would slow until it stalled 
> even though the load is 100%..
> Then I tried yet a third and it responds 'Could not connect.'
> Hmmmmm.......
> 
----
you can always telnet to a particular port to open an interactive
session though it helps if you have some anticipation of what is
required in terms of 'talk'

in the case of http protocol, obviously web browsers speak http protocol
but there are also command line tools such as wget, links (elinks) and
lynx. Most ports however are not likely to be talking http protocol.

Craig