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GeneralRe: Messenger users online/offline? Pin
Anonymous10-Nov-04 14:27
MemberAnonymous10-Nov-04 14:27 
GeneralRe: Messenger users online/offline? Pin
Christian Graus10-Nov-04 14:36
protectorChristian Graus10-Nov-04 14:36 
GeneralRe: Messenger users online/offline? Pin
[DK]KiloDunse10-Nov-04 14:41
Member[DK]KiloDunse10-Nov-04 14:41 
GeneralRe: Messenger users online/offline? Pin
Christian Graus10-Nov-04 14:54
protectorChristian Graus10-Nov-04 14:54 
GeneralRe: Messenger users online/offline? Pin
[DK]KiloDunse10-Nov-04 14:58
Member[DK]KiloDunse10-Nov-04 14:58 
AnswerRe: Messenger users online/offline? Pin
Ray Cassick10-Nov-04 16:16
MemberRay Cassick10-Nov-04 16:16 
GeneralRe: Messenger users online/offline? Pin
[DK]KiloDunse10-Nov-04 16:20
Member[DK]KiloDunse10-Nov-04 16:20 
GeneralRe: Messenger users online/offline? Pin
Fade (Amit BS)10-Nov-04 16:41
MemberFade (Amit BS)10-Nov-04 16:41 
am telling you this for a fact, the messager has an open connection with the host,
you can see it for yourself by using the "netstat -nao" command in the command prompt (run "cmd")

this will show you all active connections on your computer, including the process ID associated with each connection. you can see which process id the messager uses using the Task Manager. Select the 'Processes' tab, and then 'View' -> 'Select Columns' (this option will only show when you're in the 'Processes' tab).
then you'll see that the messanger process has an established connection.

now, how is it done? as one server might not be able to support so many simultanious connections?
If you will take a minute to experiment, you'll see that each time you log-on, the messanger logs on to a different IP, that's the load-balancing machanism, microsoft has many Messanger servers, each serving who knows how many users, and on the servers level, they are responsible for updating eachother.

It sometimes takes a minute until the messanger detects a connection loss because connection loss on tcp connection is not always detectable, so it is only detected after some timeout occurs in your client (there is probably a reflecting timeout at the server side too)

by the way, they probably went for the open connection architecture due to the fact that many users cannot accept incoming transmissions (everyone behind a router, ICS server, proxy, firewall etc.), the only way they can be sure they can send you data (like an incoming message) is an open connection you have initiated

that's about it Smile | :)


Fade (Amit BS)
GeneralRe: Messenger users online/offline? Pin
[DK]KiloDunse10-Nov-04 16:48
Member[DK]KiloDunse10-Nov-04 16:48 
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