This policy setting allows you to specify the amount of continuous idle time that must pass in an SMB session before the session is suspended because of inactivity. Administrators can use this policy setting to control when a computer suspends an inactive SMB session. If client activity resumes, the session is automatically reestablished. A value of 0 will disconnect an idle session as quickly as possible. The maximum value is 99999, which is 208 days; in effect, this value disables the setting. Countermeasure: Configure the Microsoft network server: Amount of idle time required before disconnecting session setting to 15 minutes. Potential Impact: There will be little impact because SMB sessions will be re-established automatically if the client resumes activity.

[max idle time]

(1) GPO: Computer Configuration\Windows Settings\Security Settings\Local Policies\Security Options\Microsoft network server: Amount of idle time required before suspending session (2) REG: HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\LanManServer\Parameters!autodisconnect