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WSI allows complete access to your store database, which may include sensitive data. Adherence to proper security practices defined here are mandatory for proper deployment and usage.
WSI is not really designed to import massive amounts of products, entities, or customers in a single 'pass'. While this import option can handle more at once than the standard Excel product import, we still recommend that imports be done & reviewed incrementally, and that transactions be used. See this page for more information on Transaction nodes.
Invalid security header on WSI calls
This means that you are not using time synchronization (a Windows function) on your client and web site servers. Time sync MUST be used on both machines, or SOAP calls will not work. Please see your host or IT manager for assistance with enabling time sync.