Which version of IBO?

It does help to supply all information.

What happens when you try and connect using IB_SQL?

I'll admit to fishing here, I only have Firebird on my
systems now, but IB_SQL should at least give some more
information, and I have no problem onto my Linux server,
running the applications on the windows machines.

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Lester Caine
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L.S.Caine Electronic Services