I can't log in to firebird on Ubuntu server 14.04 error 28000, what should I do?

Question

firebird

Installed ubuntu server 14.04
Installed APACHE, PHP, FIREBIRD, transferred the site (The site works with the Firebird database)
Everything works but I can’t log in to the database from which I successfully work in Windows
The error is this:

test@ubuntu:~$ isql-fb
Use CONNECT or CREATE DATABASE to specify a database
SQL> CONNECT "localhost:/var/www/html/DBSITE.FDB" user 'SYSDBA' password 'masterkey';
Statement failed, SQLSTATE = 28000
Your user name and password are not defined. Ask your database administrator to set up a Firebird login.
SQL>

Website error: Your user name and password are not defined. Ask your database administrator to set up a Firebird login.
PHP and Firebird clearly work, but not quite as expected.
All that has been done and all that has been installed:

apt-get install apache2
apt-get install php5
apt-get install firebird2.5-super
apt-get install php5-interbase
php5enmod interbase

Answer 1

To be honest, I installed Firebird under Linux only once (under CentOS) and quite a long time ago. But I remember that by default he did not set the password for sysdba to "masterkey", but generated a random one and wrote it down in some text file. Maybe it's the same here?