> It runs on this host(10.10.10.18). Even more, my daemon writen in C++
> works from that host with the same database.

Then I have no idea.

I still suspect that this is a network problem. Try to build driver
from the source (use Branch_1_0) and add some logging into
org.firebirdsql.jgds.GDS_Impl.java (especiall in isc_attach_database
and connect methods).

On what port your database is running? If this is not 3050, did you
specify the port in connection string?

Best regards,
Roman