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 »  Home  »  Windows Vista Troubleshooting Page 1  »  Path Maximum Transmission Unit (PMTU) Black Hole Router Detection
Path Maximum Transmission Unit (PMTU) Black Hole Router Detection
By  Super Admin  | Published  12/9/2006 | Windows Vista Troubleshooting Page 1 | Unrated
Path Maximum Transmission Unit (PMTU) Black Hole Router Detection

The following is a list of black hole router detection changes that are included in Windows Server 2003 SP2:

• By default, black hole detection is turned on. 
• Black hole probing is performed only for connections in established or advanced states. 
• Black hole probing is performed only for connections on which there is no full-size segment acknowledgement. 
• If black hole probing fails, the TCP Maximum Segment Size (MSS) of the connection is restored to what it used to be before probing. 
• With black hole router detection turned off in versions of Windows that are earlier than Windows Server 2003 SP2, a connection times out approximately after 63 * RTT. In Windows Server 2003 SP2, connections time out after 71 * RTT.

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