I am getting a 

port 22: Connection refused

error while connecting to a server.

I have both the openssh client and server installed, and they are running. But still there is an error. Please help.

7

7 Answers

I went through this issue and finally got appropriate answer.

sudo apt-get update sudo apt-get install openssh-server sudo ufw allow 22

Then went into raspi-config in a terminal window and enabled ssh.

This will allow port 22 to be used for sshd.

4

While on the server, check to make sure sshd is actually running, and is listening on port 22:

$ sudo netstat -anp | grep sshd tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 1538/sshd tcp6 0 0 :::22 :::* LISTEN 1538/sshd

If you don't get results, or they don't show you're listening on tcp 0.0.0.0:22... fix that.

If you DO show that sshd is running and is listening on tcp port 22, check to make sure there's no firewall rule getting in the way. Again, on the server:

$ sudo iptables -L | grep ssh DROP tcp -- anywhere anywhere tcp dpt:ssh

Or alternately, 

$ sudo ufw verbose Status: active To Action From -- ------ ---- 22 DENY Anywhere 22/tcp DENY Anywhere

If you do see a rule like one of the ones above, you'll need to fix that.

If you don't see any firewall rules in the way and you do see the service running on the server, then it's time to check your workstation, and the network it's connected to. Can you connect to other servers? Can you ping your own interface or loopback address? Etc.

6

Try this

sudo apt-get remove openssh-client openssh-server

and then

sudo apt-get install openssh-client openssh-server

it worked for me :)

Probably not the most orthodox solution... :)

2

Came across same problem after installing Raspbian. Solution that worked for me:

sudo apt-get purge openssh-server sudo apt-get install openssh-server
3

The following commands worked for me:

cd /root/.ssh vi known_hosts

Now delete everything in that file and enter on the terminal:

service sshd restart

Source: SSH - Connection Refused

1

This might fix it for you as well. Try port forwarding connection 22 from your outgoing IP address to your local IP on the same port. Worked for me allowing me to ssh in to remote ubuntu computer.

The static IP was wrong in my case. Found out by doing ping <my_ip> after switching off the server. It was still pinging even when the server was off. Correcting the IP solved the issue.