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Troubleshooting RealPort in AIX Troubleshooting RealPort in AIX
Check for carrier detect.
All tty and lp devices are modem devices. They require DCD in
order to respond. The preferrence is to wire DCD from the device
to the port. If DCD is not asserted check to see if the device is
powered on and online. Check the LEDs on the port.
If an 8 pin RJ45 cable is being used and DSR is asserted
but not DCD, use the following command on the Portserver:
set flow altpin=on ra=.
If DCD is not wired then force carrier must be enabled. This can
be set in
smit tty --> change/show characteristics --> tty## --> force carrier --> enable.
LP devices are supposed to ignore carrier but I have seen systems
that do require DCD. To force carrier, use the following command
in AIX:
chdev -l lp## -a forcedcd=enable
the chdev command only needs to be issued once.
Alternately, put the following command in an appropriate startup script
/usr/lbin/tty/stty-digi forcedcd /dev/lp##
the stty-digi command needs to be issued at each system boot.
Make sure that the PS is configured correctly.
set config
Check IP address, Submask, Gateway, Myname, and Nameserv.
The first three must be correct, the second two must be correct if
you are using DNS services.
Check for stuck processes:
- On the portserver, type:
who
- If a proccess (RealPort or otherwise) is running on the port,
type:
kill tty=[port#]
or unplug the serial device and reboot the PS.
- Check the LEDs on the port to see if OFC is on.
If so, try typing control-Q from a terminal attached to the port,
or from the portserver, type:
kill tty=[port#]
Make sure that the AIX host can reach the ports on the PS
Once who shows no processes on the port, from the AIX server,
type:
telnet [PS ip] [2000+port number]
{i.e. 2001 for port 1, 2016 for port 16}
If the host cannot telnet to the port then RealPort won't
connect to it. Double check the previous set commands on the PS.
Check that the RealPort sa is pointing to the correct PS
From AIX, type:
smit dev --> Digi Portservers --> Change show --> sa##
There are entries for IP address and node name. Use only one or
the other, not both. Make sure that it is the correct IP
address or node name for the particular PS. If using the
node name, make sure that the host can ping or telnet to that
node name. (ping nodename)
Check the status of the RealPort daemon
From AIX, type:
ps -ef | grep ncx
Note the time that the daemon started. Check again several
minutes later. If the time has changed then the daemon attempted
to connect to the PS, failed and tried again.
Reasons why the daemon will fail to connect and ways to reconnect
If RealPort preceives that a devices is busy, it can
keep it from reconnecting to the PS. A device is
considered busy if a print queue has print jobs in it, or
a non-getty login proccess such as Pick is used on
a tty.
A way to discover which tty or lp device is busy, from AIX, type:
rmdev -l sa## -R
Rmdev will not define a device if it is busy. Rmdev will error
out and stop on the device that is busy. Stop or kill the process
on the device then re-execute rmdev. Once rmdev has defined all
tty and lp devices and the sa device, the RealPort daemon is
removed.
To restart the daemon type:
mkdev -l sa##
The sa will become available and the tty and lp devices will become
available. The print queue or login process may need to be
restarted.
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