Re: Cannot connect with Telnet client, other TCP/IP clients

[Jim Oberholtzer <midrangel@xxxxxxxxxxxxxxxxx>]

Pete;

Yesterday I had very similar difficulties at a client.  Differences are 
this is P6, HMC console,  and LPARs but I don't think that's a factor 
since you were able to get in with the LAN console.  Routing on this box 
is correct, although that could be a problem for you as well.    We just 
restarted the telnet server and it started working without having to 
recreate anything.  We have experienced similar problems with the SMTP 
server as well.  I'm starting to wonder if there is a fault somewhere 
deep in TCP.   We have a PMR open and are working it actively however 
every time we try to trace it, we do not see a failure.

We were planning on getting all the most recent PTFs/Groups etc hoping 
there was a problem that was fixed but it seems you have debunked that 
theory.  That system is not that far back in PTFs anyway but it never 
hurts to hope...

In the mean time try a telnet server restart.   Have you tried NETSTAT 
to see if the route is valid?

Jim Oberholtzer
Chief Technical Architect
Agile Technology Architects


On 8/1/2012 2:10 AM, Pete Helgren wrote:
> Got a brand spanking new 720 up and running.  Initially I had the
> operations console connected, I configured an Ethernet line and
> connected via telnet (5250). I also connected via IBM i navigator. I
> even FTP'd a file from the old iSeries over to the new 720 (both running
> IBM i 7.1) All seemed well.  I disconnected the telnet session after
> signing off.  Ended the navigator session and moved on to other things.
> I went back to check on something but the 5250 session wouldn't
> connect.  So I started ops console and check for errors and saw none.
> After playing around with various settings, routings, and decided to
> completely retrace my steps.  I deleted the all the configuration
> objects.  Started from scratch.
>
> I created new Ethernet line description, added the interface, added the
> default route, varied on the line, started the interface and then
> started the telnet server.  Still, no joy.  I downloaded the TCP/IP
> group PTF and applied it.  No change.
>
> The first time I connected with telnet, a new virtual device description
> was created.  I deleted it to see if it would be recreated.  It has
> not.  So I am not sure just where the issue is. I can ping the default
> gateway but I can't reach any other device on the subnet.
>
> I'm stumped. It seems like a routing issue but......
>
> I*think*  I saw something similar recently on this list but the archives
> are offline at the moment.  Any ideas where to look next?
>
> -- Pete Helgren Value Added Software, Inc www.petesworkshop.com GIAC 
> Secure Software Programmer-Java
> --