Help with gcli2 Credential Acquisition Failure

A user reports a critical issue with the gcli2 tool during credential acquisition. Previously, credentials worked normally for reverse proxy operations, but subsequently encountered 403 errors. After deleting credentials, connection authentication failed, displaying ‘code=not acquired, state=None’, and when attempting to obtain credentials, the message ‘All connection attempts failed’ appeared. The user tried switching multiple nodes, mirror URLs, and official endpoints, but the problem remained unresolved. This help post reveals authentication challenges in tool usage, involving network credential management and connection failure mechanisms, providing practical reference value for other users troubleshooting similar technical issues, reflecting common fault diagnosis needs in technical communities.