GATEKEEPER.MCAST.NET again (unexpected traffic)

[TSaplin Mikhail]

Recently I wrote, that I have litle traffic to GATEKEEPER.MCAST.NET,
(tcpdump show this:
20:32:41.496039 129dial.supernet.kz.52075 > GATEKEEPER.MCAST.NET.1718: udp 31
)

David Malone <dwmalone at maths.tcd.ie> on my question wrote:
>Does sockstat show which process is using port 52075?
No, sockstat show nothing about this.

I've installed new system due express installation - but packets is steel 
going.

Maybe this is going on your 5.1 system, and is this right?