<<# ls -lart /var/lib/firebird/system/security2.fdb
-rw------- 1 firebird firebird 1171456 Aug 14 14:25 /var/lib/firebird/system/security2.fdb>>

Is this a distro specific install or the more generic Firebird one from SourceForge?
I ask, because on MacOS the default security is the following
-rw-r--r-- 1 pbeach staff 729088 Feb 15 16:54 security2.fdb
And on install I do not make any effort to change it.

Regards
Paul Beach
Tel (France): +33 (0) 2 47 58 30 43
Mob (France): +33 (0) 6 79 24 32 32