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Event ID: 4230 Source: Tcpip

Source
Level
Description
TCP/IP has chosen to restrict the congestion window for several connections due to a network condition.  This could be related to a problem in the TCP global or supplemental configuration and will cause  degraded throughput.
Comments
 
As per a Microsoft support forum post, the most common cause for this warning is due to a bug in the network card drivers. The suggestion is to update the drivers with the latest update. If this fails to fix the problem, the TCP/IP stack can be re-installed using the following command:

netsh int ip reset

followed by a reboot. However, some users reported that none of these suggestions fixed the problem.

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