There was a topic about this a few weeks ago where the same happened on Windows Vista. The conclusion - backed by some testing - was: it simply does not work with Firebird 1.5. Firebird 2.1 does work.

> I have update IpcName in firebird.conf to
>
> IpcName = Global\FirebirdIPI
>
>
> I also restart my Firebird 1.5 application (I run as application) but it
> doesn't work. I still get "unavailable database"
>
> > 2. If your database is located under ...\Program Files\ you might be
> bumping into a Windows 7 rule that forbids access to files in that area from
> a local shell. If you can't move the database then you'll be stuck with a
> tcp/ip connection.
>
> My database is located in my document folder.
>
> > 3. Is it Classic server you are running? In Fb 1.5 you cannot connect
> to Classic using the IPC local connect.
>
> I am using SuperServer.
>
> Please note that I am using Windows 7 64 bits. I am not sure if 64 bits
> windows has any issue with Firebird 1.5.
>
> Just for your information, I can connect to Firebird 2.1 in Windows 7 64
> bits using local connection string without any problem.

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