Can't open more than 128 connections

hello,
 
I'm trying to open 300 connections to a database using Microsoft odbc
.NET and psqlodbc.  At the 129th connection attempt i get an
exception:
 
{"ERROR [IM005] [Microsoft][ODBC Driver Manager] Driver's
SQLAllocHandle on SQL_HANDLE_DBC failed" }
State: "IM005"
 
.  Is there some config param i need to set on the connection string so that
i can take more connections?  what am i doing wrong?
thank you

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