Hi,

> I am trying to connect to Firebird with JayBird and DbVisualizer,
> but when I try to connect I receive this message:
>
> org.firebirdsql.jdbc.FBSQLException: Resource Exception. Unable to
> complete network request to host "localhost".
> Reason: Unable to complete network request to host "localhost".
> ...
> Why this happen?

Because system either does not know what is "localhost" or there is no
application listening on port 3050, where driver tries to connect.

Check if:

- JDBC URL is correct;

- "localhost" can be resolved to 127.0.0.1 (you can do "nslookup
localhost" and get IP address of 127.0.0.1);

- There is Firebird server running on your local computer.

Best regards,
Roman Rokytskyy