How to solve: "Connect to host some_hostname port 22: Connection timed out"
- by Aufwind
I have two Ubuntu machines. Both have openssh-client and openssh-server installed on them. ssh-ing from machine G (fresh Ubuntu 11.10 installation) to machine K works great. But ssh-ing from machine K to machine G results always in the Error:
Connect to host some_hostname port 22: Connection timed out
I went through the troubleshooting section of help.ubuntu.com and I got the following results:
ps -A | grep sshd # results in
848 ? 00:00:00 sshd
-
sudo ss -lnp | grep sshd # results in
0 128 :::22 :::* users:(("sshd",848,4))
0 128 *:22 *:* users:(("sshd",848,3))
-
ssh -v localhost # works!
-
sudo ufw status verbose # yields: "Status: inactive"
I haven't change anything in the config file. What can I do to locate the Problem and solve it? Glad about every hint!
Edit:
ping was succesful in both directions!
I did a telnet <machineK> 22 from machin G which resulted in Trying and then in telnet:
Unable to connect to remote host: Connection timed out.
But telnet the other way around worked just fine!
Edit 2:
ssh start/running, process 966 # yields: ssh start/running, process 966
/etc/hostname # contains my hostname, let's call it blubb
/etc/hosts # contains the following
127.0.0.1 localhost
# 127.0.1.1 blubb
129.26.68.74 blubb # I added this!
-
sudo service ufw status # yields: ufw start/running
I installed Gufw and set it to ON. Then I selected from Incoming the option ALLOW. Then I sshed to another machine from where I sshed back to my machine. Still the same error as above: connect to host blubb port 22: Connection timed out
Any more hints, what I can check?
