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In ODBC, when you use multiple data source names (DSNs) to connect to the same SQL Server server (and you use the same server name), the most recent DSN's Network Library replaces the Network Libraries in other DSNs.
There is only one Network Library entry under each SQL Server server name in the following registry key:
When a new DSN is created for the same SQL Server server, the existing Network Library under this registry entry is replaced by the Network Library used in the new DSN.
Steps to Reproduce BehaviorFor example: