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azureubuntusshtimeoutvirtual-machine

Why do I always get timeout when trying to SSH from Ubuntu 22.04 into my Azure Linux virtual machine?

I am running Ubuntu 22.04 LTS and I bought a VM on Azure recently. Today, when I tried to log in using SSH, I failed to log in.

The command I am using is ssh -i ~/.ssh/<KEY> user@public_IP_address.

I am trying to use the SSH command from Ubuntu's bash terminal but also tried using PuTTy unsuccessfully earlier today.

Solution

  • I tried the same in my environment got the same error like below:

    enter image description here

    This error usually occurs if network security group rules for the virtual machine port 22 (SSH) is not open for inbound traffic rule.

    To check this use telnet <vmpublicip> 22 it is not open connection to the host you need to update the NSG rules to allow your IP address to connect.

    enter image description here

    In virtual machine -> networking -> Add inbound port rule -> destination port add 22 like below:

    enter image description here

    Now, when I try to connect with SSH using ssh user@public_IP_address or ssh -v -i ~/.ssh/id_rsa user@public_IP_address it connected successfully like below.

    enter image description here

    If still error persists, check if the vm is in running status by navigating to boot diagnostics and serial log as below:

    enter image description here

    Check uncomplicated firewall status, firewall is blocking SSH connections and that rules are in active using below command:

    sudo ufw status
sudo ufw allow ssh
sudo ufw enable

    Status: active

To                         Action      From
--                         ------      ----
22/tcp                     ALLOW       Anywhere
22/tcp (v6)                ALLOW       Anywhere (v6)

    enter image description here