
Use the ICISite interface BlockSiteToSite property to check if site-to-site transfers are blocked, and to allow or prohibit site-to-site transfers.
Signature:
HRESULT BlockSiteToSite([out, retval] VARIANT_BOOL *pVal);
HRESULT BlockSiteToSite([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.