> I have one customer having this error message very often when he
> starts software after he boots up his computer which is as server as
> well
>
> "no permission for read-write access to database
> C:\DATA\CUSTOMERS.FDB"
>
> He runs the software on Windows 8.1 Professional Version.
>
> What could be a reason for this problem?

* Are we talking about Firebird Embedded or a real Firebird server process?
* If the later, have you tried using a TCP/IP connection, even locally?


As the error states, for whatever reason, it doesn't have read/write
permission on the database file.

So, with Embedded, make sure that the user running the application has
proper permissions on the folder/file. With a regular Firebird server
setup, check if the Windows account used by the Firebird server Windows
service has proper privileges.



--
With regards,
Thomas Steinmaurer
http://www.upscene.com/

Professional Tools and Services for Firebird
FB TraceManager, IB LogManager, Database Health Check, Tuning etc.