I got a nice 'feature' in denyhosts
while I'm trying to connect to my ssh server over 'O2 Germany's UMTS' in /var/log/messages appeared:
Jul 26 16:24:51 server sshd[10916]: error: PAM: Authentication failure for root from 1.106.113.82.net.de.o2.com
Jul 26 16:24:53 server sshd[10931]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=1.106.113.82.net.de.o2.com user=root
Jul 26 16:24:55 server sshd[10916]: error: PAM: Authentication failure for root from 1.106.113.82.net.de.o2.com
Jul 26 16:24:55 server sshd[10916]: Failed keyboard-interactive/pam for root from 82.113.106.1 port 5935 ssh2
Jul 26 16:26:29 server sshd[11028]: warning: /etc/hosts.deny, line 4: can't verify hostname: getaddrinfo(0.121.113.82.net.de.o2.com, AF_INET) failed
in /etc/hosts.deny line4: 1.106.113.82
looks like an ip-address, but was a name...
i were able to connect again and again...