[jdev] How is a client crash communicated to the XMPP server?

Peter Saint-Andre stpeter at stpeter.im
Mon Jun 9 09:52:41 CDT 2008

On 06/09/2008 12:27 AM, JabberForum wrote:
> Peter Saint-Andre;727 Wrote: 
>> On 06/03/2008 1:15 AM, JabberForum
>> wrote:[color=blue][color=green][color=darkred]
>> If a client disconnected ungracefully, it will send nothing, so the
>> server will need to poll the TCP connection periodically (if the
>> connection is idle); this is typically done using so-called
>> "whitespace
>> pings" as described here:
>> http://tinyurl.com/6kjqwt
> Thanks Peter for the comments. The RFC states that the TCP polling
> interval is configurable.
> <snip>
> The time between such "whitespace pings" is a matter of implementation
> and local service policy; however, it is RECOMMENDED that these pings be
> sent not more than once every 60 seconds.
> </snip>
> Is there a default polling interval ?.. or is that also dependent on
> the xmpp server implementation? 

That depends on the server implementation.

> I have been working with Jabber XCP server and i only found a "polling
> director" component which has a session timeout field which is nothing
> but ---> "the number of seconds after which the server terminates the
> session if the client has not sent a poll request."
> I think this is purely at (the higher) xmpp level and does not talk
> about TCP polling, or does it ..?

This is probably a whitespace ping at the TCP level (not an "XMPP Ping"
via XEP-01999), but you could contact the Jabber XCP developers for
further information.


Peter Saint-Andre

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