Problem establishing SNA session over DLSw link

We are experiencing sporadic problems establishing an SNA session over a DLSw tunnel. The session is between a Tandem host and a CICS region on OS/390. A Cisco 7500 router performs one end of the DLSw link; that same router is channel-attached to the OS/390 mainframe using CIP and uses CSNA for SNA traffic.
The connection is initiated by the SNA software on the Tandem box, but it rarely works on the first attempt. The session goes into a pending state and has to be cancelled and re-tried. This has to be repeated until such time it is successful. Once the session is started it works without problem.
At the point of attempting to start the session all the components are in the 'correct' state, i.e.
-DLSw tunnel is connected
-Host PU is in 'connectable' (CONCT) state
-Host XCA defining CIP SNA and virtual lines are active
No action needs to be taken on the OS/390 end of the link (or anywhere else for that matter) between start attempts on Tandem.
From device traces on OS/390 my suspicion is that the session requests are not actually getting to VTAM on OS/390 for some reason. DLSw traces on 7500 appear the same in both case of success or fail of session start.
Has anyone experienced this, or know of problems in this area that may explain what we are seeing?
Thanks.
Keith

Mary,
thanks for the extra information.
I would advice at this point the following:
Open a case with the Tac. Provide the information you have at that point and agree on a action plan, i.e. what to look at what trace to take, when you are able to recreate the problem.
What i can see from the documents you attaches is the following:
I only see sna circuits in the dlsw circuit history.
In you show dlsw reach there are quite some netbios names aswell and a large number of mac addresses learned from the remote peer.
You may want to discuss some filter options with the tac to make sure we cut down on the size of the reach cache and to make sure we advertise only those mac addresses which are really needed.
From the show version, 12.1(17) should be fine for dlsw in the way you described it.
From the show dlsw circuit history detail we have a couple of times that circuits are disconnecting.
Most of the time these circuits are up for a long time and they get the following sequence before terminating:
Index local addr(lsap) remote addr(dsap) remote peer
1157627904 4000.0410.0001(08) 0800.8e00.9708(08) 10.19.2.124
Created at : 12:02:55.115 GMT Mon Nov 29 2004
Connected at : 12:02:55.447 GMT Mon Nov 29 2004
Destroyed at : 22:04:01.158 GMT Wed Dec 1 2004
Local Corr : 1157627904 Remote Corr: 3321888773
Bytes: 140092/145133 Info-frames: 1748/2327
XID-frames: 1/2 UInfo-frames: 0/0
Flags: Remote created, Local connected
Last events:
Current State Event Add. Info Next State
CONNECTED DLC DataInd 0x0 CONNECTED
CONNECTED WAN infoframe 0x0 CONNECTED
CONNECTED DLC DataInd 0x0 CONNECTED
CONNECTED WAN infoframe 0x0 CONNECTED
CONNECTED WAN infoframe 0x0 CONNECTED
CONNECTED DLC DataInd 0x0 CONNECTED
CONNECTED WAN infoframe 0x0 CONNECTED
CONNECTED DLC DataInd 0x0 CONNECTED
CONNECTED WAN infoframe 0x0 CONNECTED
CONNECTED DLC DataInd 0x0 CONNECTED
CONNECTED WAN infoframe 0x0 CONNECTED
CONNECTED WAN infoframe 0x0 CONNECTED
CONNECTED DLC DataInd 0x0 CONNECTED
CONNECTED ADM WanFailure 0x0 HALT_NOACK_PEND
HALT_NOACK_PEND DLC DiscCnf 0x0 CLOSE_PEND
CLOSE_PEND DLC CloseStnCnf 0x0 DISCONNECTED
this circuit was up for more than a month and the reason for disconnection was ADM WAN failure which means the dlsw peer went away at some point.
Some other circuits get these sequence:
CONNECTED WAN infoframe 0x0 CONNECTED
CONNECTED WAN halt-dl 0x0 HALT_PENDING
WAN halt-dl means the other end tells us to disconnect. No information on this end why. Most of the time it is a legitimate disconnect. but you would need to look at the dlsw peer to get information who terminated the session.
I dont see anything specific in a sense that a circuit did not go to connect at all. In the information you supplied.
Again my advice open a case with the tac and then you can work the issue to completion.
thanks...
Matthias

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# similar for protocol version 2
#HostbasedAuthentication no
# Change to yes if you don't trust ~/.ssh/known_hosts for
# RhostsRSAAuthentication and HostbasedAuthentication
#IgnoreUserKnownHosts no
# Don't read the user's ~/.rhosts and ~/.shosts files
#IgnoreRhosts yes
# To disable tunneled clear text passwords, change to no here!
PasswordAuthentication yes
PermitEmptyPasswords no
# Change to no to disable s/key passwords
ChallengeResponseAuthentication no
# Kerberos options
#KerberosAuthentication no
#KerberosOrLocalPasswd yes
#KerberosTicketCleanup yes
#KerberosGetAFSToken no
# GSSAPI options
#GSSAPIAuthentication no
#GSSAPICleanupCredentials yes
# Set this to 'yes' to enable PAM authentication, account processing,
# and session processing. If this is enabled, PAM authentication will
# be allowed through the ChallengeResponseAuthentication and
# PasswordAuthentication. Depending on your PAM configuration,
# PAM authentication via ChallengeResponseAuthentication may bypass
# the setting of "PermitRootLogin without-password".
# If you just want the PAM account and session checks to run without
# PAM authentication, then enable this but set PasswordAuthentication
# and ChallengeResponseAuthentication to 'no'.
UsePAM yes
#AllowAgentForwarding yes
AllowTcpForwarding yes
#GatewayPorts no
X11Forwarding yes
X11DisplayOffset 10
X11UseLocalhost yes
PrintMotd no # pam does that
#PrintLastLog yes
#TCPKeepAlive yes
#UseLogin no
UsePrivilegeSeparation sandbox # Default for new installations.
#PermitUserEnvironment no
#Compression delayed
#ClientAliveInterval 0
#ClientAliveCountMax 3
#UseDNS yes
#PidFile /run/sshd.pid
#MaxStartups 10:30:100
#PermitTunnel no
#ChrootDirectory none
#VersionAddendum none
# no default banner path
#Banner none
# override default of no subsystems
Subsystem sftp /usr/lib/ssh/sftp-server
AllowUsers hulk
# Example of overriding settings on a per-user basis
#Match User anoncvs
# X11Forwarding no
# AllowTcpForwarding no
# ForceCommand cvs server
ssh_config
# $OpenBSD: ssh_config,v 1.27 2013/05/16 02:00:34 dtucker Exp $
# This is the ssh client system-wide configuration file. See
# ssh_config(5) for more information. This file provides defaults for
# users, and the values can be changed in per-user configuration files
# or on the command line.
# Configuration data is parsed as follows:
# 1. command line options
# 2. user-specific file
# 3. system-wide file
# Any configuration value is only changed the first time it is set.
# Thus, host-specific definitions should be at the beginning of the
# configuration file, and defaults at the end.
# Site-wide defaults for some commonly used options. For a comprehensive
# list of available options, their meanings and defaults, please see the
# ssh_config(5) man page.
# Host *
# ForwardAgent no
ForwardX11 yes
# RhostsRSAAuthentication no
# RSAAuthentication yes
# PasswordAuthentication yes
# HostbasedAuthentication no
# GSSAPIAuthentication no
# GSSAPIDelegateCredentials no
# BatchMode no
# CheckHostIP yes
# AddressFamily any
# ConnectTimeout 0
# StrictHostKeyChecking ask
# IdentityFile ~/.ssh/identity
# IdentityFile ~/.ssh/id_rsa
# IdentityFile ~/.ssh/id_dsa
# Port 22
# Protocol 2,1
# Cipher 3des
# Ciphers aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc
# MACs hmac-md5,hmac-sha1,[email protected],hmac-ripemd160
# EscapeChar ~
# Tunnel no
# TunnelDevice any:any
# PermitLocalCommand no
# VisualHostKey no
# ProxyCommand ssh -q -W %h:%p gateway.example.com
# RekeyLimit 1G 1h
ServerAliveInterval 120
and the command i'm using to ssh in
ssh -X -p 22 user@hostip
i can log in fine every time, but when i do
startx
the openbox session starts on the remote machine, when obviously i want to view it on the client. i should also add i'm using urxvt to ssh in. also, please be aware this is a very basic setup as i'm just starting with ssh.
thanks
Last edited by yabasta (2013-11-06 16:44:37)

yabasta wrote:i'm trying to run an entire xwindows session - the complete openbox-session - over ssh.
If this is the case, why not use a tool that was designed specifically for this purpose? You could set up vnc and then forward the ports to run over ssh. But I have been playing with x2go, which is a open-source NoMachine alternative. It is super easy to set up and runs over ssh. What is really cool is that it actually runs far better than plain ol' vnc with a super responsive desktop.
I don't really have much practical use for it, but after playing with vnc a bit and seeing the shitty performance that it can sometimes have, I heard about NoMachine and decided to give it a whirl. I think the best part is that because it runs over ssh, it is as secure as your sshd setup is. So if you want to open it up to face the greater internet, as long as you feel confident in doing that with ssh, there is no additional ports you need to open up or anything.

Problem establishing SNA session over DLSw link

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