hello to all. i'm new i linux and in my job a i'm a technical support and linux servers are the ones that we are using. i must learn linux well in order to pursue my work and also i find it interesting with this linux thing. so i hope you can help me alot...
i know few commands in linux terminal, and also alot dont know. pls help.
first, my machine and my officemates machine are ubuntu installed. i tried to connect him through ssh but the message says like this....root@lee:~#


ssh rodel@192.168.1.171
ssh: connect to host 192.168.1.171 port 22: Connection refused

i all erady installed ssh-server... before i can connect but when my officemates reformats his machine, i can no longer connect through ssh. pls help. and more power linux team....

May be you are using key based authentication and probably while re-installing, you may have lost the private keys. Tell your server admin to provide you the new ssh keys.

Log in as a regular user instead. For one thing, root should be disabled unless you have two servers automatically replicating, or something similar. Secondly, root logins are disabled in Ubuntu. I don't use Ubuntu, so maybe disabling PAM (UsePAM no in /etc/ssh/sshd_conf) and using rsa or dsa keys for authentication would bypass this issue. For logging in manually, it is best to log into a regular account and use sudo. The root account is one that hackers will bang against in a brute force attack.

Moved: This thread is more suitable in Linux-Networking and has been moved accordingly to help your thread/question get the exposure it deserves.