Use the ICISite interface BlockAntiTimeOut property to check if the site is blocking anti-time-out traffic, or to block or allow anti-time-out traffic from clients.
HRESULT BlockAntiTimeOut([out, retval] VARIANT_BOOL *pVal);
HRESULT BlockAntiTimeOut([in] VARIANT_BOOL newVal);
True = Blocked
False = Allowed
Refer to Site FTP Settings Properties for an illustration of how this and other ICISite properties can be accessed in the Administrator interface.