设置 sharepoint 会话过期时间

https://msdn.microsoft.com/en-us/library/office/hh147183(v=office.14).aspx
http://blog.robgarrett.com/2013/05/06/sharepoint-authentication-and-session-management/
$ap = Get-SPSecurityTokenServiceConfig
$ap.LogonTokenCacheExpirationWindow = (New-TimeSpan -minutes 40)
$ap.Update();
IIsreset