>I'm using Firebird 2.5.2 and on the machine in question have created two databases late last year.  Using Isql, I put the CREATE SCHEMA in with credentials and get this message back.
>
>Statement failed, SQLSTATE = 08006
>connection lost to database
>
>Note that I can query the other two Dbs, run inserts etc.  I've turned off my anti-virus, and have run the command window with escalated privilege.
>
>So then I tried it with FlameRobin, - 0.9.3.5  and get this error:
>***IBPP::SQLException ***
>Context: Database::Create
>Message: isc_dsql_execute_immediate failed
>SQL Mesage : -902
>Unsuccessful execution caused by a system error that precludes
>successful exectuion of subsequent statements
>Engine Code  :335544721
>Engine Message:
>Unable to complete netw ork request to host "localhost".
>Error writing data to the connection.

This is outside my field of expertise, so if others answer, their answer will probably be better. I'm just recommending you to try two things:

1) Define the database in your ALIASES file (your Firebird settings could require the file to be defined there)
2) Check that the file in question does not exist

HTH,
Set