Poor Network Performance with the CPU Stuck in WfpAleFastUdplnspection()

 Jeff here again. Today’s post is about the Windows Firewall and a potential performance problem. When Windows 7, 8, 8.1, 2008 R2, 2012 or 2012 R2 are under very heavy load (20,000+ incoming UDP connections) Windowsperformance may suffer. Symptoms include very high CPU usage, and very slow network throughput. This is caused by the Windows…

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GetShortPathName() doesn’t return short path name

Another amazing write up from Nitin Dhawan, Senior Support Engineer, Windows SDK team, EMEA/INDIA Background of the issue ====================== This Issue was reported as, GetShortPathName() returned C:\veryverylongpath as short path for a given path C:\veryverylongpath, while expectation was that it should return something like C:\veryve~1 as the short path name. Due to this reason, the business…

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UDP – Closesocket() takes upto 5 seconds to return in disconnect/remote host down scenario due to pending data to send

The following write up from the support lines comes to us by one of the senior and key resources in Windows SDK EMEA/INDIA team, Nitin Dhawan Socket(DATAGRAM…); Sendto(….); Closesocket();  The above works just fine, except the scenario when remote host is down, or just that the cable is unplugged. The socket() and sendto() calls would…

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