Experiencing "TCP/IP has reached the security limit imposed on the number of concurrent TCP connect attempts" with IPCheck

When using IPCheck with many sensors on Windows XP SP2 you may get the message "TCP/IP has reached the security limit imposed on the number of concurrent TCP connect attempts". This message is caused by a new security function of Windows XP Service Pack 2 which was included in order to avoid the quick and rampant distribution of worms. XP SP2 doesn't allow any program to open more than 10 outgoing, half-open, (still) unconnected TCP connections.

There are two possible solutions:

  • Set the entry 'Limit open sensor requests', under the 'Sensors' page in the IPCheck Control Panel to a maximum value of 10. This value should suffice for a few hundred sensors being monitored every second with an average response time of 1-2 seconds per sensor.
  • Disable the limitation of SP2. See Related Articles Section below
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