MSS: (KeepAliveTime) How often keep-alive packets are sent in milliseconds Counter Measure: Configure the MSS: (KeepAliveTime) How often keep-alive packets are sent in milliseconds (300,000 is recommended) entry to a value of 300000 or 5 minutes. The possible values for this registry entry are: ? 1 through 0xFFFFFFFF. The default configuration is 7,200,000 (two hours). In the SCE UI, the following list of options appears: ? 150000 or 2.5 minutes ? 300000 or 5 minutes (recommended) ? 600000 or 10 minutes ? 1200000 or 20 minutes ? 2400000 or 40 minutes ? 3600000 or 1 hour ? 7200000 or 2 hours (default value) ? Not Defined Potential Impact: Keep-alive packets are not sent by default by Windows. However, some applications may configure the TCP stack flag that requests keep-alive packets. For such configurations, you can lower this value from the default setting of two hours to five minutes to disconnect inactive sessions more quickly. Fix: (1) GPO: Computer Configuration\Administrative Templates\MSS (Legacy)\MSS: (KeepAliveTime) How often keep-alive packets are sent in milliseconds (2) REG: HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Tcpip\Parameters!KeepAliveTime