![]() This value is not configured by default, but it can be entered to change the default number of retries.Ĭhange the following subkey in Windows 7, Windows 2008 R2, Windows 2008, Windows 2000, Windows Vista, Windows 2003, and Windows XP: The TcpMaxDataRetransmissions registry value controls the number of times that TCP retransmits an individual data segment before it aborts the connection. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:ģ22756 How to back up and restore the registry in Windows Then, you can restore the registry if a problem occurs. For added protection, back up the registry before you modify it. Therefore, make sure that you follow these steps carefully. However, serious problems might occur if you modify the registry incorrectly. Important This section, method, or task contains steps that tell you how to modify the registry. This can cause long delays for a client to time-out on a slow link.įor more information about the latest service pack for Windows 2000, click the following article number to view the article in the Microsoft Knowledge Base:Ģ60910 How to obtain the latest Windows 2000 service pack TCP connections that are made over high-delay links take much longer to time out than those that are made over low-delay links.īy default, after the retransmission timer hits 240 seconds, it uses that value for retransmission of any segment that has to be retransmitted. ![]() By using this algorithm, TCP tunes itself to the normal delay of a connection. The timer for a given segment is doubled after each retransmission of that segment. However, it is adjusted on the fly to match the characteristics of the connection by using Smoothed Round Trip Time (SRTT) calculations as described in RFC793. The retransmission timer is initialized to three seconds when a TCP connection is established. The default value for this parameter is 5. If no acknowledgment has been received for the data in a given segment before the timer expires, the segment is retransmitted, up to the TcpMaxDataRetransmissions value. ![]() ![]() TCP starts a retransmission timer when each outbound segment is handed down to IP. ![]()
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