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I am using Firebird embedded and in OnBeforeConnect of the UniConnection I ran this:

SpecificOptions.Values['InterBase.Role'] := 'RDB$ADMIN';
SpecificOptions.Values['InterBase.ClientLibrary'] := AppPath + 'db\fb\gds32.dll';

which gave me unavailable db errors using UniDac v6 until I changed it to this:

SpecificOptions.Text := 'InterBase.Role=RDB$ADMIN' + CRLF +
'InterBase.ClientLibrary='+ AppPath + 'db\fb\gds32.dll';

Strange, I checked Subversion and this WAS the only change needed..

Hello,

Please provide the error message text or a screenshot.

Hi AlexP,
I can't reproduce now, but I know the error.
It's when one tries to open an embedded fdb without the embedded DLL.
Essentially the server DLL in the System dir was used.

Indeed, such an error occurs when you use an incorrect client library version.