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Status Delivered
Workspace IBM Host On-Demand
Categories Protocol enhancement
Created by Guest
Created on Oct 19, 2022

RELATED IDEAS

Add a "real" keepalive functionality for HOD Printer Sessions

Using HOD 14.0.5 (and also on 12.0.6) cached client, there is a problem that printer sessions seem to disconnect silently after about 5 minutes, probably because of some networking component cutting the idle connection.

The "keepalive connection" functionality, as described in the online help, does not fulfill this requirement:

hod/en/help/advanced.html#keepalive

"Select Yes if you want the client to close the connection when the destination address is no longer available."

But in our case, the destination address is still available and netstat shows "ESTABLISHED".

Idea priority Medium
  • Guest
    Reply
    |     Aug 1, 2024
    Thank you very much for verifying this enhancement request for the Telnet Keep-Alive support. We appreciate your feedback. This enhancement was indeed delivered in HOD 15.0.2.
  • Guest
    Reply
    |     Jul 17, 2024

    Hello IBM!
    It appears, that our RFE has been realized with HOD v15.0.2 already.
    We have updated one of your staging systems recently, and I've noticed the "Telnet Keep Alive Enhancement" :

    https://www.ibm.com/docs/en/host-on-demand/15.0?topic=new-functions-in-host-demand-version-150

    With this release, Host On-Demand supports Telnet Keep-Alive. A Keep-Alive packet is sent to the host at regular intervals to check if it is still reachable. Two keep alive mechanisms are supported: NOP, and TIMING-MARK.

    Indeed: when I enable the Telnet Keep-Alive (NOP, 60 seconds) then the printer session no longer disconnects behind the scenes, and we don't see hung print jobs after five minutes idle time anymore.

    Also, I noticed in a wireshark trace, that the keepalive has a negligeable overhead (only one packet sent and one received).

    So it seems that our request is perfectly fulfilled.
    Thank you very much! Feel free to close this idea.

    Best regards,

    Chris

  • Guest
    Reply
    |     Oct 27, 2022
    A preliminary evaluation of this request indicates that it is consistent with our business strategy. Further evaluation of this RFE is underway.

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