Keep Alive settings determine how often TCP sends keep-alive transmissions. TCP sends Keep Alive transmissions to verify that an idle connection is still active. Oracle recommends that you reduce this setting to 30 minutes. For details on updating the KeepAlive settings, see the Microsoft knowledge base article:
http://www.microsoft.com/resources/documentation/Windows/2000/server/reskit/en-us/Default.asp?url=/resources/documentation/Windows/2000/server/reskit/en-us/regentry/58768.asp