> I have problem connection Firebird server from Java.
> I described it there:
> http://groups.yahoo.com/group/firebird-support/message/46140
> cause I thought it is server problem not JDBC.
> But I successfully connected and used it from isql program.

What did you specify in the isql? Did you use

CONNECT '/mnt/....' USER 'SYSDBA' PASSWORD 'MASTERKEY';

or

CONNECT 'localhost/3050:/mnt/...' ....

If the former, try connecting using the second approach. I did exactly the
same you described in your post on my Debian installation and I was not able
to connect to the fb_inet_server. Though when connecting via inetd
everything works fine (as well as when connecting without specifying server
and port).

Also you should upgrade your JayBird installation - current version is 1.5
RC4 and you use Beta3.

Roman