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ORA-12557: TNS:protocol Adapter Not Loadable When Trying to Use the 32-bit Oracle ODBC Driver on 64-bit Windows (Doc ID 1516753.1)

Last updated on NOVEMBER 20, 2023

Applies to:

Oracle ODBC Driver - Version and later
Microsoft Windows (32-bit)
Microsoft Windows x64 (64-bit)
*** Currency Check was done on 24th Dec 2018 ****


Applies to all Windows 64-bit OS.

When trying to connect using the 32-bit Oracle ODBC Driver the error occurs: ORA-12557: TNS:protocol adapter not loadable error.


 Both 32-bit and 64-bit Oracle client and odbc where installed on the machine.


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