NoMachine NX: Public key authentication failed

kronos:~ # nxserver --usercheck massive
NX> 900 Verifying public key authentication for NX user: massive.
NX> 900 Adding public key for user: massive to the authorized keys file.
NX> 900 Verifying public key authentication for NX user: massive.
NX> 500 ERROR: Public key authentication failed
NX> 500 WARNING: NX server was unable to login as user: massive
NX> 500 WARNING: Please check that the account is enabled to login.
NX> 500 WARNING: Also check that user's home directory, the directory
NX> 500 WARNING: ~/.ssh and the file ~/.ssh/authorized_keys2 have
NX> 500 WARNING: correct permissions according to the StrictModes of
NX> 500 WARNING: your SSHD configuration
NX> 999 Bye.