Unable to connect to database with encoding cp1251
[root@nixos:~]# isql /var/db/firebird/data/fortest.fdb -u sysdba -p masterkey
Statement failed, SQLSTATE = 2C000
CHARACTER SET WIN1251 is not installed
-At trigger 'TRIGGER_ON_CONNECT' line: 19, col: 1
Use CONNECT or CREATE DATABASE to specify a database
Unable to connect to database with encoding cp1251