AllowUser, DenyUser don't work.

Hello,
I try to restrict some kind of login through AllowUser and DenyUser but
failed.
openssh version: 4.5
What I want: disable root login from network outside 192.17.0.0
What I wrote into /etc/ssh/sshd_config
***************************
DenyUsers root
AllowUsers root@xxxxxxx*
***************************
However, after that not only root can not login from anywhere, but all
the other accounts are also disabled

Anything I did wrong?

Regards,
Zhuang Liang.





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