What's this SSH error about "incorrect RSA1 identifier" and "unspecified GSS failure"?

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http://unix.stackexchange.com – How can I fix this SSH problem? SSH debug errors When issuing ssh -vvv user@host the output includes the following debug messages: [...] debug3: Incorrect RSA1 identifier debug3: Could not load "/home/user/.ssh/id_rsa" as a RSA1 public key [...] debug1: Unspecified GSS failure. Minor code may provide more information Credentials cache file '/tmp/krb5cc_1000' not found [...] The symptom of the problem My SSH keyring is not automatically unlocked at system login. I'm asked for the passphrase each time. My temporary fix I give the command ssh-add I will no longer be asked for my passphra (HowTos)