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Calling setsockopt with MCAST_JOIN_GROUP results in error 10014: The system detected an invalid pointer address in attempting to use a pointer argument in a call.

Using similar code on Linux works...

I ran with different message sizes, and found that 1024 bytes packets did indeed move faster than 1025 bytes packets on the SP3 box. I tried setting FastSendDatagramThreshold to 1500, but it didn't...

What you need to do is convert the integers in your struct to network byte order before sending, then back to host byte order after you receive it. Since the int fields are 32 bit, use htonl() to...

I reproduced this issue with some shortened sample programs, which are attached (the transmitter takes an IP and port as the first two args). As before, SP2 -> SP3 ran close to the full 100Mbps,...

Windows firewall is off on both sides, and VirusScan on/off on either side doesn't make a difference.

Hello,

I have a multicast file transfer program which seems to be having some issues with speed on particular versions of Windows.

I had a user of the software email me saying he was unable to...