Study Notes

One machine whose IP is 192.168.123.78, and could be accessed by ssh. Later, I re-installed this machine with the same Linux system, and then try to log in by ssh, but to my surprise, I was refused! So many times I tried, finally found the resolution: On my own computer, “vi” the file “/root/.ssh/known_hosts”, and delete the line comprising the strings “192.168.123.78”. At this time, I could login on 78 successfully.