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TCP/IP Settings Check


We validate if a KeepAliveTime DWORD value exists under HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Tcpip\Parameters and verify that it is set to a recommended value.

Exchange TCP KeepAliveTime should be set to 30 minutes or no less than 15 minutes. If there's no entry in the registry for KeepAliveTime then the value is 2 hours. This value, if not set correctly, can affect both connectivity and performance. You must make sure that the load balancer and any other devices in the path from client to Exchange be set correctly.

The goal is to set Exchange with the lowest value so that client sessions when ended, are ended by the Exchange and not by a device.


Client -> Firewall (1 hour) -> NLB (40 minutes) -> Exchange Servers (20 Minutes)

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Additional resources:

Checklist for Troubleshooting Performance Related issues in Exchange 2013, 2016 and 2019 (on-prem)

Last update: April 19, 2022