If this problem comes on a Windows machine, do the following.
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Go to Credential Manager
in Czech, it is called: Správce pověření
in Dutch, it is called: Referentiebeheer
in French, it is called: Gestionnaire d'identification
in German, it is called: Anmeldeinformationsverwaltung
in Italian, it is called: Gestione credenziali
in Norwegian, it is called: Legitimasjonsbehandling
in Polish, it is called: Menedżer poświadczeń
in Portuguese, it is called: Gerenciador de Credenciais
in Russian, it is called: Диспетчер учётных данных
in Spanish, it is called: Administrador de credenciales
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Go to Windows Credentials
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Delete the entries under Generic Credentials
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Try connecting again. This time, it should prompt you for the correct username and password.