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In the AWS management console, I stopped a Linux instance. Then I restarted it. I tried to reconnect via Putty. My putty session has an "Auto-login username" set and a private key for SSH authentication set. AWS's DHCP gave my instance a new IP address upon rebooting. So I changed the IP address in Putty. When I try to connect via Putty I get this error:

"Disconnected: No supported authentication methods available (server sent: publickey,gssapi-keyex,gssapi-with-mic)"

How do I connect via Putty to my Linux instance? I was able to connect fine before I rebooted it using AWS. I tried using a different user. But I don't even get to the password prompt. It says "Server refused our key."

  • You could read this question: superuser.com/questions/421997/… It might be that, due to the ip address change, your machine's fingerprint also changed, which could cause the issue with Putty. – Mladen B. Mar 7 '15 at 12:29
  • How do I generate a new .pem file (assuming the above applies to my situation)? – Propulsion Mar 7 '15 at 20:11
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You must specify SSH key in the putty for that server, attach key in the putty's left menu -> SSH->Auth->Private key file for authentication->Browse

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  • I did what you described to reproduce the problem. Does it need a new SSH key after a reboot happens? – Propulsion Mar 7 '15 at 20:10

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