How to shorten timeout for connection to a non-existing IP

[Posted to the server.networking group with no response]

This command

C:\>telnet 123.45.67.89 1521
Connecting To 123.45.67.89...Could not open connection to the host, on
port 1521: Connect failed

comes back with Connect failed error in about 20 or 21 seconds. What
can be done to shorten this time? I tried these registry settings at
HKLM\System\CurrentControlSet\Services\Tcpip\Parameters:

KeepAliveTime 120000
TcpTimedWaitDelay 120000
TcpWindowSize 64512
TCPMaxRetransmissions 1

The telnet still hangs for about 20 seconds. What am I missing?
Thanks.

Yong Huang
.

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