Troubleshooting DenyHosts

DenyHosts, a software which blocks malicious ssh attempts, is installed by default on all of our managed servers. To check if any authentic hosts are blocked from sshing you can run:

sudo cat /etc/hosts.deny

If there are any blocked hosts you will see a section like below (111.222.333.444 is a placeholder IP):

# DenyHosts: Tue Aug  7 11:53:04 2018 | sshd: 111.222.333.444

sshd: 111.222.333.444

IGPP HelpDesk is automatically notified of any blocked hosts. If you would like to be added to the email list for blocked IPs on your managed server, send a request to igppticket@ucsd.edu.