I think this usually happens because the driver requires some environment variable to be set before connecting e.g., DB2 likes DB2INSTANCE setting. Perhaps there is something similar with the Sybase driver.

In reply to Re^9: Connecting to sqlserver2008 - DBD::Sybase connectivity and unixODBC issue by mje
in thread Connecting to sqlserver2008 - DBD::Sybase connectivity and unixODBC issue by venu_hs

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