Vista - Socket error 10052 on UDP socket

We have a .NET 2.0 desktop application which sends and receives network
packets over UDP.

Several users have reported an occasional socket error 10052 which happens
when the code calls socket.BeginReceiveFrom on a the UDP socket.

What does this mean?

The official MS documentation for socket error 10052 says - quote:
"WSAENETRESET (10052) Network dropped connection on reset . The connection
has been broken due to keep-alive activity detecting a failure while the
operation was in progress. It can also be returned by setsockopt if an
attempt is made to set SO_KEEPALIVE on a connection that has already
failed."

This just doesn't make much sense for a UDP socket since UDP is a
connectionless protocol.

I know that another close error code 10054 in connection with UDP sockets
means that an ICMP message "Port Unreachable" was received, and I am
wondering if 10052 might map to another ICMP message?

I have googled this for months, read network books, etc. but can't find
anything.
Please help - what does socket error 10052 on a UDP socket mean?

Thanks in advance,
Jesper