This is something we discovered when we found a server or two was hitting a ceiling on the number of available connections it could make outbound or in. Just thought I’d post it here for posterity and so I can remember it next time.
Here’s a summary of it but in case the page disappears:
Registry: HKEY_LOCAL_MACHINE\CurrentControlSet\Services\Tcpip\Parameters > TcpTimeWaitDelay (DWORD Value)
Range is 30-300 seconds. Default is 240.
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