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I would check the audit log and review the login failures. Access denied is a generic error, the audit log knows more.

Hi,
the error is quite generic and it basically says that you can't login but you don't know why.

Check that the superserver port is the same used in studio,

Check the license on the instance.

If the everything is fine, fire up the management portal, go to
system administration -> security -> auditing -> enable auditing
and check that the auditing is enabled. After that go to
system administration -> security -> auditing ->  configure system events
and check that
%System/%Login/LoginFailure
is enabled. If not click on "change status".

Try to login again with studio and check the audit database
system administration -> security -> auditing -> view audit database
and see what error comes up

Pietro