UDP zero packet size?

I was looking at a flow of traffic from a windows 7 desktop,
You can see normal traffic tcp and udp to an internal server
then 443 (HTTPS) traffic to several different external IP's
then I see one connection from port 46106 UDP to a server in IRAN on port 35640 (UDP)  packet size 0
then it goes back to 443 TCP https traffic.

I checked the IP address that is located in Iran and it is blacklisted.

So my question is regarding UDP. What does it mean when the packet size is 0? and why would a
Farmerbob212Asked:
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giltjrCommented:
I don't think you saw a "connection" on a UDP port.  UDP is connectionless.

You may have seen a UDP packet where the source port was 46106  and destination port of 35640.

They may have been probing to see if there was something listening on UDP port 35640.

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Kamran ArshadIT AssociateCommented:
frankhelkCommented:
No comment has been added to this question in more than 21 days, so it is now classified as abandoned.

I have recommended this question be closed as follows:

Accept: giltjr (https:#a40650426)

If you feel this question should be closed differently, post an objection and the moderators will review all objections and close it as they feel fit. If no one objects, this question will be closed automatically the way described above.

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