Ian

... and "before" was when you used VTAM obviously and probably 
understood "USS" to mean "Unformatted System Services".[1]

The fact that you hark back to the good old days may indicate that you retain 
the entirely reasonable expectation that, if data can find its way from A to B, 
it should jolly well be able to find its way back from B to A - a "given" in 
the 
connection-oriented SNA world.

Regrettably, thanks, I was told, to Iosef Vissarionovich Dzhugashvili, aka 
Stalin and his propensity for aiming WMD at the US, the network invented to 
cater for the mass destruction of communication facilities which could result 
from a launch of these weapons, IP is connectionless.

This is all a massively verbose way to hint that your problem may be simply 
that the outbound route works but the inbound route does not. Thus, before 
you go to all the trouble of tracing anything in the old "VTAM buffer" way, you 
might like to try the traceroute command at the B node in order to find out 
where the routing definitions are "broken".

I hope you'll be able to say "I'll drink to that!"

Chris Mason

[1] I see my preference for this usage has attracted some notoriety; regular 
contributor Timothy has used it as an example of the proper use of the list!

[2] In a reassignment/redesign of the library at an education centre where I 
used to work into a sort-of "internet cafe" without the coffee, a blank space 
was left between two doors with busy corridors on two sides. It seemed 
obvious to me - but not the local management - that it was the ideal location 
for a bust of the person most responsible for inspiring the Internet.

Chris Mason

On Mon, 21 Jul 2008 23:49:31 +0100, Ian S. Worthington 
<[EMAIL PROTECTED]> wrote:

>I've been asked to look at some problems communicating with an application
>running under USS from a z/linux system.
>
>Symptoms seem to be that the input's arriving and being processed, but the
>reply message isn't making it back.
>
>What's the best way of tracing ip comms under uss?  When I used to do this
>before it was get a vtam buffer trace, but I'm not sure if there's a better
>way under uss.
>
>Suggestions welcome.
>
>
>ian
>...
>
>Ian S. Worthington, MBCS.
>
>me:     http://isw.me.uk/
>photos: http://gallery.isw.me.uk/
>
>Dulce et decorum est pro patria mori, sed dulcius pro patria vivere, et
>dulcissimus pro patria biber. Ergo, bibiamo pro salute patriae.

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