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AAlvz
Asked: 2013-08-22 15:06:00 +0800 CST

How to to avoid "Port 22: Connection refused" error on SSH port (22)?

  • 772

I have a server where I just use openssh, openvpn and rabbitmq (which requires a lot of erlang dependencies).

Every time I reboot my server I can't access to it anymore getting

Port 22: Connection Refused

And I have to install everything from scratch.

What should I check to avoid this problem??

ssh

3 Answers

  1. To view your firewall settings in a terminal perform the following: -

    sudo iptables -L -n

    you looking for somehting ike this

    # iptables -L -n
Chain INPUT (policy ACCEPT)
target     prot opt source               destination
ACCEPT     tcp  --  anywhere             anywhere            tcp dpt:ssh
DROP       all  --  anywhere             anywhere

    if no port ssh (22) rule is set then try:

    sudo iptables -I INPUT -p tcp -m tcp --dport 22 -j ACCEPT

    save current iptables firewall rules to a file called /root/dsl.fw, type:

    # iptables-save > /root/dsl.fw

    To restore iptables rules, enter:

    iptables-restore < /root/dsl.fw

    To restore rules automatically upon Linux system reboot add following command to your /etc/rc.local file, enter:

    # vi /etc/rc.local

    Append the line:

    /sbin/iptables-restore < /root/dsl.fw

    To check what init services are running and at what run level try this in a terminal

    ls /etc/rc*.d

    if sshd is not listed do then enter this in your terminal:

    update-rc.d ssh enable
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  2. Port 22: Connection Refused

    This message indicates that a firewall is actively blocking your connection attempt or alternatively that sshd is not listening on that port.

    Verify that:

    1. The iptables rules applied on boot allow traffic on port 22
    2. sshd is set to start on boot
    • 3

  3. Just try (as root)

    sudo apt-get install ssh

    i havn't ssh server in standard ubuntu desktop installation

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