You can find troubleshooting documentation <https://cloud.google.com/compute/docs/troubleshooting/troubleshooting-ssh> about SSHing into a Compute Engine instance [1]. In the future, please make sure that your screenshots are in English or provide a description that is in English so that other people may be able to help your more easily. Additionally, make sure that your future Compute Engine issues are posted in gce-discussion instead, as this is a Google App Engine group.
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