Connection problem Error:10054

I am trying to register a SQL 2000 server from the SQL Management Studio of a SQL 2005 Server. I get the following error
TITLE: Connect to Server
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Cannot connect to xx.xx.xx.32.
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ADDITIONAL INFORMATION:
A connection was successfully established with the server, but then an error occurred during the login process. (provider: TCP Provider, error: 0 - An existing connection was forcibly closed by the remote host.) (Microsoft SQL Server, Error: 10054)
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everyone is point to the following link but i am not entirely sure this is the case from me as i dont have any ssl installed.http://support.microsoft.com/kb/919710/en-us
Please advise how do i debug the problem.
I can ping/telnet:1433 to the server without any problem
I have disabled the shared memory in in sql native client configuration and changed the tcp/ip protocal as the first in the order list.

Try the query window and force your connection to use TCP and NP and see what you get...
tcp:<server name>
np:<Server name>

tcp:server1 gives the following error in the query window is the sytax correct ?
Msg 102, Level 15, State 1, Line 1
Incorrect syntax near 'server1'.
however if i try this i still get the same error:
Cocuments and SettingsSqlservice>sqlcmd -S tcp:10.xx.xx.xx
HResult 0x2746, Level 16, State 1
TCP Provider: An existing connection was forcibly closed by the remote host.
Sqlcmd: Error: Microsoft SQL Native Client : Communication link failure.