I got this problems.. since last 3 weeks... so i came here to find
helps...

root@itdkel:/home/amir# /usr/lib/firebird2/bin/isql
61.49.24.54:/opt/data/tiket/hputra.gdb -u SYSDBA -p masterkey
Statement failed, SQLCODE = -902

Your user name and password are not defined. Ask your database
administrator to set up a Firebird login.
Use CONNECT or CREATE DATABASE to specify a database
SQL> quit;
root@itdkel:/home/amir# /usr/lib/firebird2/bin/isql
61.49.24.54:/opt/data/tiket/hputra.gdb -u SYSDBA
Statement failed, SQLCODE = -902

Your user name and password are not defined. Ask your database
administrator to set up a Firebird login.
Use CONNECT or CREATE DATABASE to specify a database
SQL> quit;
root@itdkel:/home/amir# /usr/lib/firebird2/bin/isql
61.49.24.54:/opt/data/tiket/hputra.gdb
Statement failed, SQLCODE = -923

connection rejected by remote interface
Use CONNECT or CREATE DATABASE to specify a database
SQL>


Why this appear : Your user name and password are not defined. Ask
your database administrator to set up a Firebird login.?

need helps