Applies To: Windows Server 2003, Windows Server 2003 R2, Windows Server 2003 with SP1, Windows Server 2003 with SP2


Data type Range Default value


0 | 1



Specifies whether individual applications can alter the type of service (TOS) bits in the header of outgoing IP packets. In general, individual applications should not be allowed to manipulate TOS bits, because this can defeat system policy mechanisms.

Activation Method

You must restart the computer for changes to this entry to take effect.


  • Every IP datagram has an octet commonly known as the TOS byte. The first three bits specify a level of priority. The next four bits, interpreted as a number, specify a type of service. The last bit is currently unused. For more information about the TOS byte, see IETF RFC 1349: Type of Service in the Internet Protocol Suite.