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I am not much experienced with ubuntu servers and ssh connections, but I would like to allow ssh connections in a ubuntu machine. I am trying to connect (ssh) to this ubuntu machine (which I setup in a virtual machine). That's the server status:
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And these are the host info:
However I am unable to establish a connection:
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ssh: connect to host 10.0.2.15 port 22: Connection timed out
I guess I am missing something and I would be glad for any help.
user3091668user3091668
2 Answers
In the VirtualBox > Machine > Settings > Network > Adapter 1
Select Attached to: Bridged Adapter and the name of your network card (it's probably already selected)
KatuKatu
First Method:
USING BRIDGED ADAPTER
Second method:
USING NAT ADAPTER
Note:
Free ports chosen if using firewall both on host and guest
George UdosenGeorge Udosen
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This article helps you find and correct the problems that occur due to Secure Shell (SSH) errors, SSH connection failures, or SSH is refused when you try to connect to a Linux virtual machine (VM). You can use the Azure portal, Azure CLI, or VM Access Extension for Linux to troubleshoot and resolve connection problems.
Note
Azure has two different deployment models for creating and working with resources: Resource Manager and classic. This article covers using both models, but Microsoft recommends that most new deployments use the Resource Manager model.
If you need more help at any point in this article, you can contact the Azure experts on the MSDN Azure and Stack Overflow forums. Alternatively, you can file an Azure support incident. Go to the Azure support site and select Get support. For information about using Azure Support, read the Microsoft Azure support FAQ.
Quick troubleshooting steps
After each troubleshooting step, try reconnecting to the VM.
Continue reading for more detailed troubleshooting steps and explanations.
Available methods to troubleshoot SSH connection issues
You can reset credentials or SSH configuration using one of the following methods:
After each troubleshooting step, try connecting to your VM again. If you still cannot connect, try the next step.
Use the Azure portal
The Azure portal provides a quick way to reset the SSH configuration or user credentials without installing any tools on your local computer.
To begin, select your VM in the Azure portal. Scroll down to the Support + Troubleshooting section and select Reset password as in the following example:
Reset the SSH configuration
To reset the SSH configuration, select
Reset configuration only in the Mode section as in the preceding screenshot, then select Update. Once this action has completed, try to access your VM again.
Reset SSH credentials for a user
To reset the credentials of an existing user, select either
Reset SSH public key or Reset password in the Mode section as in the preceding screenshot. Specify the username and an SSH key or new password, then select Update.
You can also create a user with sudo privileges on the VM from this menu. Enter a new username and associated password or SSH key, and then select Update.
Check security rules
Use IP flow verify to confirm if a rule in a network security group is blocking traffic to or from a virtual machine. You can also review effective security group rules to ensure inbound 'Allow' NSG rule exists and is prioritized for SSH port (default 22). For more information, see Using effective security rules to troubleshoot VM traffic flow.
Check routing
Use Network Watcher's Next hop capability to confirm that a route isn't preventing traffic from being routed to or from a virtual machine. You can also review effective routes to see all effective routes for a network interface. For more information, see Using effective routes to troubleshoot VM traffic flow.
Use the Azure VM Serial Console
The Azure VM Serial Console provides access to a text-based console for Linux virtual machines. You can use the console to troubleshoot your SSH connection in an interactive shell. Ensure you have met the prerequisites for using Serial Console and try the commands below to further troubleshoot your SSH connectivity.
Check that SSH is running
You can use the following command to verify whether SSH is running on your VM:
If there is any output, SSH is up and running.
Check which port SSH is running on
You can use the following command to check which port SSH is running on:
Your output will look something like:
Use the Azure CLI
If you haven't already, install the latest Azure CLI and sign in to an Azure account using az login.
If you created and uploaded a custom Linux disk image, make sure the Microsoft Azure Linux Agent version 2.0.5 or later is installed. For VMs created using Gallery images, this access extension is already installed and configured for you.
Reset SSH configuration
You can initially try resetting the SSH configuration to default values and rebooting the SSH server on the VM. This does not change the user account name, password, or SSH keys.The following example uses az vm user reset-ssh to reset the SSH configuration on the VM named
myVM in myResourceGroup . Use your own values as follows:
Reset SSH credentials for a user
The following example uses az vm user update to reset the credentials for
myUsername to the value specified in myPassword , on the VM named myVM in myResourceGroup . Use your own values as follows:
If using SSH key authentication, you can reset the SSH key for a given user. The following example uses az vm access set-linux-user to update the SSH key stored in
~/.ssh/id_rsa.pub for the user named myUsername , on the VM named myVM in myResourceGroup . Use your own values as follows:
Use the VMAccess extension
The VM Access Extension for Linux reads in a json file that defines actions to carry out. These actions include resetting SSHD, resetting an SSH key, or adding a user. You still use the Azure CLI to call the VMAccess extension, but you can reuse the json files across multiple VMs if desired. This approach allows you to create a repository of json files that can then be called for given scenarios.
Reset SSHD
Create a file named
settings.json with the following content:
Using the Azure CLI, you then call the
VMAccessForLinux extension to reset your SSHD connection by specifying your json file. The following example uses az vm extension set to reset SSHD on the VM named myVM in myResourceGroup . Use your own values as follows:
Reset SSH credentials for a user
If SSHD appears to function correctly, you can reset the credentials for a giver user. To reset the password for a user, create a file named
settings.json . The following example resets the credentials for myUsername to the value specified in myPassword . Enter the following lines into your settings.json file, using your own values:
Or to reset the SSH key for a user, first create a file named
settings.json . The following example resets the credentials for myUsername to the value specified in myPassword , on the VM named myVM in myResourceGroup . Enter the following lines into your settings.json file, using your own values:
After creating your json file, use the Azure CLI to call the
VMAccessForLinux extension to reset your SSH user credentials by specifying your json file. The following example resets credentials on the VM named myVM in myResourceGroup . Use your own values as follows:
Use the Azure classic CLI
If you haven't already, install the Azure classic CLI and connect to your Azure subscription. Make sure that you are using Resource Manager mode as follows:
If you created and uploaded a custom Linux disk image, make sure the Microsoft Azure Linux Agent version 2.0.5 or later is installed. For VMs created using Gallery images, this access extension is already installed and configured for you.
Reset SSH configurationSsh Into Vm
The SSHD configuration itself may be misconfigured or the service encountered an error. You can reset SSHD to make sure the SSH configuration itself is valid. Resetting SSHD should be the first troubleshooting step you take.
The following example resets SSHD on a VM named
myVM in the resource group named myResourceGroup . Use your own VM and resource group names as follows:
Reset SSH credentials for a user
If SSHD appears to function correctly, you can reset the password for a giver user. The following example resets the credentials for
myUsername to the value specified in myPassword , on the VM named myVM in myResourceGroup . Use your own values as follows:
If using SSH key authentication, you can reset the SSH key for a given user. The following example updates the SSH key stored in
~/.ssh/id_rsa.pub for the user named myUsername , on the VM named myVM in myResourceGroup . Use your own values as follows:
Restart a VM
If you have reset the SSH configuration and user credentials, or encountered an error in doing so, you can try restarting the VM to address underlying compute issues.
Azure portal
To restart a VM using the Azure portal, select your VM and then select Restart as in the following example:
Azure CLI
The following example uses az vm restart to restart the VM named
myVM in the resource group named myResourceGroup . Use your own values as follows:
Azure classic CLI
The following example restarts the VM named
myVM in the resource group named myResourceGroup . Use your own values as follows:
Redeploy a VM
You can redeploy a VM to another node within Azure, which may correct any underlying networking issues. For information about redeploying a VM, see Redeploy virtual machine to new Azure node.
Note
After this operation finishes, ephemeral disk data is lost and dynamic IP addresses that are associated with the virtual machine are updated.
Azure portal
To redeploy a VM using the Azure portal, select your VM and scroll down to the Support + Troubleshooting section. Select Redeploy as in the following example:
Azure CLI
The following example use az vm redeploy to redeploy the VM named
myVM in the resource group named myResourceGroup . Use your own values as follows:
Azure classic CLI
The following example redeploys the VM named
myVM in the resource group named myResourceGroup . Use your own values as follows:
VMs created by using the Classic deployment model
Try these steps to resolve the most common SSH connection failures for VMs that were created by using the classic deployment model. After each step, try reconnecting to the VM.
Additional resources
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