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I asked the same question in stackoverflow.com and was told that this would be a better place to ask. I'm running an Ubuntu Server 13.10. I can connect to it using SSH from any computer except my laptop (MacBook 2007, OSX 10.6.8). OpenSSH was installed using port.
When I try to connect to the server, it will always be added to the host.deny. Nevertheless it is possible to connect to the server of my university with denyhost active. When I'm connected to the university server, it is also possible to connect to mine using the same command.
/var/log/denyhosts:
2014-08-31 22:49:28,183 - denyhosts : INFO new denied hosts: ['xxx.xxx.xxx.xxx']
2014-08-31 22:49:28,183 - denyhosts : INFO new suspicious logins: ['username - xxx.xxx.xxx.xxx']
2014-08-31 22:49:58,283 - denyhosts : INFO new suspicious logins: ['username - xxx.xxx.xxx.xxx']
/etc/denyhosts.conf
SECURE_LOG = /var/log/auth.log
HOSTS_DENY = /etc/hosts.deny
PURGE_DENY = 1y
BLOCK_SERVICE = sshd
DENY_THRESHOLD_INVALID = 5
DENY_THRESHOLD_VALID = 10
DENY_THRESHOLD_ROOT = 1
DENY_THRESHOLD_RESTRICTED = 1
WORK_DIR = /var/lib/denyhosts
SUSPICIOUS_LOGIN_REPORT_ALLOWED_HOSTS=YES
HOSTNAME_LOOKUP=YES
LOCK_FILE = /run/denyhosts.pid
ADMIN_EMAIL = root@localhost
SMTP_HOST = localhost
SMTP_PORT = 25
SMTP_FROM = DenyHosts <nobody@localhost>
SMTP_SUBJECT = DenyHosts Report
AGE_RESET_VALID=5d
AGE_RESET_ROOT=25d
AGE_RESET_RESTRICTED=25d
AGE_RESET_INVALID=10d
DAEMON_LOG = /var/log/denyhosts
DAEMON_SLEEP = 30s
DAEMON_PURGE = 1h
question
What would cause such strange behaviour, and how can I fix it?
