So in windows 10, windows defaults to using it's auto tuning feature for network traffic. Best I can tell this just allows sliding tcp window. Microsoft mentions that there may be issues using this feature with older network hardware. We have been seeing an issue with RDP where it will take 3 minutes for the password prompt to appear on an rdp connection. Setting windows auto tuning to off fixes the issue.
This issue is only through one of our vpns. Other VPNs to the same server have no lag for the password prompt. The hardware in the path is not that old as it's a fairly beefy srx.
I guess my question is... Does anyone know what Microsoft is referring to when saying auto tuning may not work with older network gear?
Secondary question, packet captures of rdp connections look identical between good and bad vpn, and yet bad vpn has this multi minute delay. So does anyone know how auto tune actually determines network health or if it does any probing I need to take into account?
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