If the password is masterkey and your server is exposed to the Internet at all — or even to a local network, unless you trust every user with the SYSDBA password — you should change it immediately. Fire up isql or another Firebird client and connect to a database. In this example, the “employee” example database is used, because its alias is always present in a freshly installed Firebird setup:

If you do this in isql, it should respond with:

The keyword is optional, and instead of USER SYSDBA you can also use CURRENT USER, which always refers to the user you are logged in as.

If the command succeeds, you won’t get any feedback. Instead, isql will just print the next “SQL>”-prompt, thus indicating that all is well and your further input is awaited.