If you can access the UI, you can execute commands against the device. I dont remember off hand which tab this is on, but you can execute
rm -rf /root/.ssh/known_hosts
Thanks for the quick reply. I ran the command in the advanced tab and now in the ssh tab I have this error in the known host display .
Warning: fopen(/root/.ssh/known_hosts) [function.fopen]: failed to open stream: No such file or directory in /pineapple/pages/ssh.php on line 142
Could not open file!‹
Not sure what do do next. I am pretty new at this.