ssh radius Access-Request by user Failed: AccessRejectException: Access Denied

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ssh radius Access-Request by user Failed: AccessRejectException: Access Denied

wangdexing
hi,
    I want to secure VNC remote access ,I refer to the article from http://www.howtoforge.com/secure_vnc_remote_access_with_two_factor_authentication ,but I have some problems dealing with it,here are some messages about it:

wdx@wdx-IdeaPad-Z465:~$ ssh user@10.12.52.32 -vvv
..........................
debug1: Roaming not allowed by server
.......................
Permission denied, please try again.

tail -f /var/log/auth.log
Mar 19 00:05:27 wdx-IdeaPad-Z465 sshd[8063]: Invalid user user from 10.12.52.32
Mar 19 00:05:27 wdx-IdeaPad-Z465 sshd[8063]: input_userauth_request: invalid user user [preauth]
Mar 19 00:05:37 wdx-IdeaPad-Z465 sshd[8063]: pam_unix(sshd:auth): check pass; user unknown
Mar 19 00:05:37 wdx-IdeaPad-Z465 sshd[8063]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=10.12.52.32
Mar 19 00:05:39 wdx-IdeaPad-Z465 sshd[8063]: Failed password for invalid user user from 10.12.52.32 port 59135 ssh2

WiKIDAdmin/Log.jsp         
2014-03-18 23:58:07.720 DEBUG com.wikidsystems.server.WikidCode5AES Passcode request processing successfully completed.
 device-9068788103614007001
2014-03-18 23:58:40.732 INFO com.wikidsystems.radius.access.WikidAccess4 Access denied for user, domain code: 010012052032 client: /127.0.0.1
2014-03-18 23:58:40.735 INFO com.wikidsystems.radius.log.DBSvrLogImpl <252> Access-Request(1) LEN=87 127.0.0.1:9008 Access-Request by user Failed: AccessRejectException: Access Denied


I have done lots of things solving it,but no effect.I am a student and all those things I did in one computer,I use ubuntu 12.04(64).
I am a beginner,so I don't know Whether I should bring more message for you to solve it ,tell me and I will show you soon.
Any help would be appreciated .

thanks,
Wang Dexing