• Subject: Re: TCPIP keepalive
  • From: "Phil Hall" <hallp@xxxxxxxx>
  • Date: Tue, 16 Jan 2001 10:08:45 -0600


> I have a vendor that is suggesting I change the TCPIP keepalive value from
> to 2 minutes so that their application can discover and recover from a
> comm./server failure better.  It is a TCPIP connection to an NT system and
> software does not recover gracefully whenever the NT system is rebooted
(oh that
> never happens).....

Some times this works OK, but if you have real slow comms links to the 400,
these can be dropped if the 2mins timeout is reached.

The vendor should be able to override the keep alive value from within their
code using the setsockopt() function, leaving the 120min default how it is
for everything else, but having 2mins just for their application on the

One of the things we've found with NT (and is probably why they are
suggesting this) is that in some situations, even when the NT box is turned
off, the AS/400 side of the connection is not informed (i.e. the socket
functions don't return SOCKET_ERROR) and the AS/400 server code has to wait
for the keepalive to kick in and then the functions return SOCKET_ERROR.


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