>>Then it might be a security related issue. Either at file system level
>>or due to the DatabaseAccess parameter in firebird.conf.
>>
>>- Are you running Classic or SuperServer?
>
>
> SuperServer
>
>
>>- Under which user is Firebird running?
>
>
> Administrator
>
>>- As an application or service?
>
>
> Service

Then I guess it's the local SYSTEM account and not Administrator?

>>- Has the user proper rights in the Firebird folder (incl. sub-folders)?

Any info on that? The local SYSTEM account needs proper rights in the
Firebird related directories, including user-created databases.

>>- Is the DatabaseAccess parameter in firebird.conf set to a specific value?
>
>
> #DatabaseAccess = Full IT IS COMMENTED!

That's fine. This is the default.


I tried to uncomment it and restartet the service but it didn't help!

> Btw. with my service there is written: "Firebird Server - Default Instance" <-- is this normal?

Yes.

i have seen only listings without "Default instance"!

>
> Additionaly i have for
> RootDirectory: C:\Program Files\Firebird\

Leave this one as:

#RootDirectory =


I for one would start from scratch.

- Deinstall Firebird 1.5
- Just to be sure, remove the entire Firebird directory. Make a copy of
security.fdb if you need any previously created Firebird users.
- Make sure gds32.dll and/or fbclient.dll in the windows system32
directory has been removed.
- Install Firebird 1.5 again
- Check file permissions for the local SYSTEM account

This might be helpful as well:
http://www.tectsoft.net/Products/Firebird/Install/Print.htm




--
HTH,
Thomas Steinmaurer
LogManager Series - Logging/Auditing Suites supporting
InterBase, Firebird, Advantage Database, MS SQL Server and
NexusDB V2 (NEW!)
Upscene Productions
http://www.upscene.com