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My public-key authentication failed on Red Hat and VShell® logged an "Unable to authenticate" error. Why?

If VShell could not authenticate and logged the following error message:

"Disconnecting from server: Unable to authenticate using any of the configured authentication methods."

there is most likely a UMASK problem.

On Red Hat, the default UMASK is 0002, which means that files are created by default with the group-writable bit set. This causes public-key authentication with vshelld to fail. To keep this from happening on newly created files, change the setting on your UMASK to make them not group-writable (set them to 0022, for example). To correct this problem with existing files, change the permissions on your .vshell and publickey folders and any files in your publickey folder so that they are writable only by the owner.

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