ftp to AIX failed

[Kenneth]

I am using AIX4.3.3 ML10 and some ftp from the main frame machine may
occassionally got stalled and failed. The system are very idle and the
network is not busy. What could I check to see if my AIX has any
problem in ftp?

[Ian Northeast]

Kenneth wrote:

>
> I am using AIX4.3.3 ML10 and some ftp from the main frame machine may
> occassionally got stalled and failed. The system are very idle and the
> network is not busy. What could I check to see if my AIX has any
> problem in ftp?

This sounds like a network problem. One common cause is a duplex
mismatch somewhere along the line. This usually autonegotiates but
sometimes it is disabled or fails. On the AIX box, use
smitty/devices/communications to check what the adapter is set to. On
the mainframe, assuming it is an IBM one with an OSA, the setting is in
the OSA configuration not in the OS. Check that these correspond with
the settings on the switch ports they are connected to. If they are set
to autonegotiate, try fixing them to something compatible e.g. 100 full
and see if that helps.

Regards, Ian