I have wrong config with ssh key. when I close my putty and then I login again server say access denied. How can I fix it.
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If the SSH Key you set for the Droplet is invalid, or does not work, you would not be able to reset the root password, so you would most likely need to submit a support ticket through the DigitalOcean CP and request that the support team either provide a temporary password or remove the SSH Key file.
Once an SSH Key is set, contacting support or simply creating a new SSH Key, uploading it through the CP, and deploying a new Droplet are really the only options.
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