Hi,
I had installed firebird 2.0.3, then uninstalled it.
Then I had installed firebird version 1.5.0.4306. The installation
was complete successfully, and the service is running. But when I
tried to connect to this DB from Borland C++ program, I received an
error:
isc_unavailable.

At the log there is an entry like this:
D-21906 (Client) Tue Apr 08 08:43:54 2008
Control services error 1061

the lines of code are:
m_pDatabase->DatabaseName = FullDatabaseName;
m_pDatabase->Params->Clear();
m_pDatabase->Params->Values[IB_USERNAME] = m_UserName;
m_pDatabase->Params->Values[IB_PASSWORD] = m_Password;
m_pDatabase->Connected = true;

* before upgrading to 2.0.3 and downgrading again, it worked ok.
also - I have external tool to DB which works ok.

what could be the problem?