Firebird 2.5. Windows 8.1. Can't connect to any database! Why? I'm trying to use a FireBird database engine. 

OS: Windows 8.1 x64(SmartScreen enabled, UAC enabled, Custom AntiVirus installed(with firewall))

FireBird: Version 2.5, Installed as SuperServer, as application without guardian.

I'm trying to manage this engine using many applications, such as FlameRobin or FireBird Maestro.

At the first:
After installation db said, that the "firebird.msg" not found in windows directory, when I tried retrieve server version.

Ok. I'm copied it to system directory from program files.

At the second(fatal):
I cant connect to my databases!

Firebird Maestro said, when I'm trying connect to created database:


Or FlameRobin(choosed context menu "Retrieve server version" for "localhost"):


I'm nothing changed. Never installed firebird database.
Default user(SYSDBA) and password(masterkey) is used, tried in any сase sensitivity.

Today, I'm tried install FireBird on Windows Server 2003, and do some in FlameRobin, and all is works!

Whay the DB not works under Windows 8.1?
If you start Firebird as an application, then Firebird must either be located in a normal folder (not a system folder under UAC protection like Program Files), or you need to run it as Administrator.

The reason is that Firebird needs write access to several files in its own program folder, which doesn't work without privilege elevation. 

Better yet: run it as a service. The service by default has sufficient rights to start Firebird.