virtualbox NAT with port forwarding served to windows 7 worked but not windows 10

[victors]

Hi,

I'm serving data from a linux virtualbox 5.1.8 r111374 (Qt5.6.1) using NAT with a forwarded udp port host and guest with same port number.

Windows 7 client pc programmed with command an receive threads can receive both the command and data from the virtualbox
but windows 10 somehow changed the data bits and I suppose the compiler then set the buffer location not writable.

Anyone encountered this problem before?

Thanks!

Best,
Victors