Microsoft Tunnel Gateway Setup step-by-step – Part 2

First step is to build a Linux Server, deploy Docker and configure a certificate.

Create Linux Server

I decided to setup a Linux server my Azure tenant and followed this guide from Microsoft: Create a Linux VM in Azure with multiple NICs – Azure Virtual Machines | Microsoft Docs

Create FireWall ports

After the machine has been created I opened the necessary Firewall ports:

az network nsg rule create --name allow_tcp_443_inbound --resource-group myResourceGroup --nsg-name myNetworkSecurityGroup --access Allow --destination-port-ranges 443 --direction Inbound --protocol tcp --priority 102

az network nsg rule create --name allow_udp_443_inbound --resource-group myResourceGroup --nsg-name myNetworkSecurityGroup --access Allow --destination-port-ranges 443 --direction Inbound --protocol udp --priority 103

az network nsg rule create --name allow_tcp_22_inbound --resource-group myResourceGroup --nsg-name myNetworkSecurityGroup --access Allow --destination-port-ranges 22 --direction Inbound --protocol tcp --priority 104

az network nsg rule create --name allow_tcp_443_outbound --resource-group myResourceGroup --nsg-name myNetworkSecurityGroup --access Allow --destination-port-ranges 443 --direction Outbound --protocol tcp --priority 202

az network nsg rule create --name allow_tcp_80_outbound --resource-group myResourceGroup --nsg-name myNetworkSecurityGroup --access Allow --destination-port-ranges 80 --direction Outbound --protocol tcp --priority 203

Set Public IP Address

Next thing is to set the public IP address of the virtual machine to Static.

1. Login to the Azure Portal
2. Find the VM between your resources
3. Select the Public IP address

4. Clicking on the IP address will give the ability to set a static IP address. Select Static and click save.

Install Docker

Connect to the virtual machine with SSH and install docker:

# Login with SSH
ssh azureuser@<public-ip>

# Install Docker
sudo apt-get update

sudo apt-get install apt-transport-https ca-certificates curl gnupg-agent software-properties-common

curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -

sudo apt-key fingerprint 0EBFCD88

sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable"

sudo apt-get update

sudo apt-get install docker-ce docker-ce-cli containerd.io

sudo docker run hello-world

sudo apt-get update

sudo apt-get upgrade

Install FTP

In order to be able to upload the certificate an FTP server needs to be installed.

# Install vsFTPd
sudo apt install vsftpd

## Adjust vsftpd config
sudo nano /etc/vsftpd.conf

Adjust or add the following in the ftp configuration:

listen=YES
listen_ipv6=NO
write_enable=YES
chroot_local_user=YES
user_sub_token=$USER
local_root=/home/$USER/ftp

pasv_enable=YES
port_enable=YES
pasv_min_port=10000
pasv_max_port=10100
pasv_address=myftpservervm.cloudapp.net
pasv_addr_resolve=YES
seccomp_sandbox=NO
allow_writeable_chroot=YES

# restart vstfpd
sudo systemctl restart vsftpd

Configure Firewall ports for FTP:

az network nsg rule create --name allow_ftp --resource-group myResourceGroup --nsg-name myNetworkSecurityGroup --access Allow --destination-port-ranges 20 21 10000 10100 --direction Inbound --protocol tcp --priority 105

Create a FTP user

# add user for ftp
sudo useradd -m username

# Set a password
sudo passwd username

# create an FTP folder
sudo mkdir /home/username/ftp

# set permissions for the user
sudo chmod 777 /home/username/ftp

Certificate

I have created a new certificate vpn.domain.com and created a DNS A-record for vpn.domain.com with the public IP address of the virtual machine.

As for the certificate, it could be in *.pem format or *.pfx format. The *.pfx was the one that worked for me. So I had to convert the certificate to a *.pfx format. make sure that the name is site.pfx and upload it.