[U-co] ssh con rsa keys - Server refused our key

[Alexander Bejarano]

Hola a todos,
tengo un problemilla... estoy configurando un login a un server con keys RSA pero no me funciona. Ya hice y revisé lo que dicen todos los manuales.ssh/authorized_keys con permissions 700 / 600pero nada. 
la key la generé con Puty gen y me funciona de maravilla en otro servidor.. pero en este no.. al guna idea?
El log del Putty me da: 
2017-05-18 15:13:36 Looking up host "server48"2017-05-18 15:13:36 Connecting to 10.25.28.142 port 222017-05-18 15:13:36 We claim version: SSH-2.0-PuTTY_Release_0.672017-05-18 15:13:36 Server version: SSH-2.0-OpenSSH_5.32017-05-18 15:13:36 We believe remote version has SSH-2 channel request bug2017-05-18 15:13:36 Using SSH protocol version 22017-05-18 15:13:36 Doing Diffie-Hellman group exchange2017-05-18 15:13:36 Doing Diffie-Hellman key exchange with hash SHA-2562017-05-18 15:13:36 Host key fingerprint is:2017-05-18 15:13:36 ssh-rsa 2048 1f:7f:5c:fd:a3:92:14:8e:6e:bb:c7:f3:89:d0:c0:d62017-05-18 15:13:36 Initialised AES-256 SDCTR client->server encryption2017-05-18 15:13:36 Initialised HMAC-SHA-256 client->server MAC algorithm2017-05-18 15:13:36 Initialised AES-256 SDCTR server->client encryption2017-05-18 15:13:36 Initialised HMAC-SHA-256 server->client MAC algorithm2017-05-18 15:13:36 Reading private key file "C:\alex\keys\key_priv.ppk"2017-05-18 15:13:36 Offered public key2017-05-18 15:13:36 Server refused our key2017-05-18 15:13:36 Using SSPI from SECUR32.DLL2017-05-18 15:13:36 Attempting GSSAPI authentication2017-05-18 15:13:36 GSSAPI authentication request refused2017-05-18 15:15:36 Server unexpectedly closed network connection
gracias... Alex.
 
Sent from my Ubuntu Linux

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abejaranoh_at_gmail.comFingerprint 3641 600E 89A6 0F87 77D0 72AB 350B C595 53EC C82EGPG Key ID  0x350bc59553ecc82e Server Key pgp.mit.edu