Zerowindow



Keywords: zerowindow
Description: After doing a capture from the source to the destination address. I keep seeing an TCP {Ack} being sent and an a{PSH}, but no {ACK}. After a minute or so I get the {TCP ZEROWINDOW PROBE}, which is causing the backup server to hang since theres no data actually being sent correctly. Not sure what wou...

Correct. TCP window probe means that the receiver has reduced his receive buffer (a.k.a. window) to zero, basically telling the sender to stop sending - usually for performance reasons. If the receiver does not recover and send an so called "Window Update" with a buffer size greater than zero (meaning, the sender is allowed to continue) the sender will become "impatient" at some point and "check" if the receiver is able to receive more data. That "check" is the Zero Window Probe you observed.

If you run into packets diagnosed as Zero Window Probe you can tell that your receiving node is not able to process incoming data fast enough. That is the typical performance problem that everybody blames the network for, while it is in fact a software/hardware problem on the receiving node.




Photogallery Zerowindow:


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