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In My environment i'm using both rhel5 & fedora 9. My previous administrator generated RSA keys in both rhel5 & fedora machines.In rhel5 (ip 192.168.0.88) fc9 (ip 192.168.0.29) recently i've changed rhel5 system ip 192.168.0.88 to 192.168.0.22, fc 9 ip changed to 192.168.0.29 to 192.168.0.217. In my lan no one is using 192.168.0.217 IP. That's why the reason i assigned that ip to fc9. Now in my system ip is 192.168.0.28, Now i was unable to login through ssh to 192.168.0.29.so again i changed it to 192.168.0.29 to 192.168.0.88 even then also i was unable to ssh to 88 machines from 28.
ssh: connect to host 192.168.0.88 port 22: Connection refused.
# rpm -q telnet-server
# vi /etc/xinet.d/telnet
disable = no
Then # service xinetd restart
# iptables -I INPUT -p tcp --dport 23 -j ACCEPT
# service iptables save
# service iptables restart
Just give following command and make sure that rule is saved.
# iptables -L
when i run the telnet command i was getting the following error.
email@example.com/telnet: Name or service not known
I enabled ip tables. This process i've done in both rhel5 systems. can any one suggest me how can i login through ssh & telnet.
Try using "ssh -vv <server>" to log in. Determine from these results and the servers logs why the connection is being refused.
Check the "known_hosts" and "authorized_keys" files. If they refer to the IP address of the server or client, the entries won't match.
Also check /etc/ssh/sshd_config. An "AllowUsers" entry like "user@<IP_ADDRESS> may not match.
Check the /etc/hosts files. If they have old entries, the IP numbers won't match the names. An entry in AllowUsers like "user@host" may fail where an entry "firstname.lastname@example.org will succeed a reverse lookup.
Also check that the permissions of the .ssh directories or the users' home directories aren't too permissive.
In addition to jschiwal's suggestion of using 'ssh -vvv', if you have access to the server logs, you'll probably get some useful information. If not, or if that does not help, try running a separate instance of the ssh server in debug mode (sshd -d): that will give a whole slew of information when you try to ssh to it.
when i was trying to login with ssh -vv <server ip> i was getting the following errors.
#ssh -vv 192.168.0.88
OpenSSH_4.3p2, OpenSSL 0.9.8b 04 May 2006
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Applying options for *
debug2: ssh_connect: needpriv 0
debug1: Connecting to 192.168.0.88 [192.168.0.88] port 22.
debug1: connect to address 192.168.0.88 port 22: Connection refused
ssh: connect to host 192.168.0.88 port 22: Connection refused
Even i've checked out the entries in .ssh/known_hosts,/etc/hosts. In /etc/ssh/sshd_config its not showing any Allow Users entry. Now i was able to login through telnet (with telnet -l ev1 192.168.0.88) but not through ssh.