What is the exact error message? Firebird doesn't use 'can't access' in
error messages, and as far as I'm aware, neither does DBeaver.
And how do you connect using ISQL? My guess is that you use ISQL with
only a path, so you aren't connecting through Firebird server, but in
embedded mode. When you use DBeaver, you connect through the server, and
the server doesn't have access to your folder.
Mark
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Mark Rotteveel