Configuring High Availability

At this point, the Unified Access Gateway has been deployed and you are able to access the Unified Access Gateway administration console and update the appliance configuration.

In this chapter, you will learn how to enable High Availability on both deployed appliances, create a cluster, test the High Availability component when accessing an internal website through the Web Reverse Proxy Edge Service, and identify how Unified Access Gateway sets appliances in the cluster as Master and Backup.


1. Validating the Reverse Proxy Settings

You will validate the Web Reverse Proxy settings to access the intranet in both appliances, using the administration consoles for UAGHA-1 and UAGHA-2 that you just logged in to.

Remember to perform the following steps on both UAGHA-1 and UAGHA-2, switching between the two browser tabs as needed to validate the settings on each Unified Access Gateway.

Acessing Reverse Proxy Settings

Perform the following steps on each appliance using the administration console, it will ensure that Web Reverse Proxy is configured on each one.

  1. Click the Show toggle by Edge Service Settings. After you click, it switches to Hide.
  2. Click the gear icon next to Reverse Proxy Settings.

1.1. Selecting the Reverse Proxy Instance Settings

Adding Reverse Proxy Settings

Click the Gear icon for the intranet instance.

1.2. Validating Intranet Reverse Proxy Settings


Click on the More hyperlink to expand the Settings, note that the Proxy Host Pattern is set to, which will resolve the virtual IP address that will be assigned to the Master Unified Access Gateway Appliance, which will forward the requested traffic to the respective appliance.

You don't need to change anything, hit the Cancel button at the bottom after confirming the Proxy Host Pattern on both Unified Access Gateway appliances.

1.3. Close the Reverse Proxy Settings

Configuration saved sucessfully

Click Close.

1.4. Validating Reverse Proxy Configuration

Validating reverse proxy configuration for intranet
  1. Click the arrow down for the Reverse Proxy Settings.
  2. Click the refresh icon for the Edge Service Settings.
  3. Confirm the intranet proxy status is GREEN.

The reverse proxy settings for the intranet website, must be GREEN, which confirms that the appliance is able to communicate with the intranet website, otherwise it shows RED.

Note: It can take a few minutes for the intranet proxy to show as GREEN. If you do not see it, click the refresh icon in Step #2 until you see the status change to either GREEN or RED.

2. Configuring High Availability on UAG-HA1


As you can see on the administration console, the High Availability Settings is set as Not Configured on UAG-HA1 appliance at this point.

Click on the High Availability Gear to configure.

2.1. Adding Virtual IP Address and Group ID

Config VIP and Group ID
  1. Enter for the Virtual IP Address
  2. Enter 50 for the Group ID
  3. Click Save

In this configuration all the incoming traffic on will be balanced by the cluster of Unified Access Gateway appliances on Group ID 50.


2.2. Monitoring High Availability State


As you save the configuration, Unified Access Gateway will broadcast a signal on the VIP subnet looking for other Appliances on the same Group ID, during that time the High Availability state will be Processing.

In the case where no other appliances are found, UAG-HA1 will become the Master and the High Availability state on the administration console will switch to Master as shown below.

NOTE - You may need to refresh the Unified Access Gateway administrator console after a few minutes to see the Processing status update to Master.


3. Configuring High Availability on UAG-HA2

Now repeat the same steps to configure the High Availability settings on UAG-HA2.

From your Chrome Browser, return to the tab where you logged into the the administration console for UAG-HA2.  The URL is

The same Virtual IP Address ( and Group ID (50) must be used on UAG-HA2 to make this appliance part of the same cluster where UAG-HA1 resides.

3.1. Monitoring High Availability on UAG-HA2

After perform the High Availability configuration on UAG-HA2, the high availability status will change to Backup.

NOTE - You may need to refresh the Unified Access Gateway administrator console after a few minutes to see the Processing status update to Backup.


4. Validating Virtual IP Address on the UAG-HA1 Virtual Machine

Validate VIP

Return to the vSphere Web Client to validate the assignment of the additional Virtual IP Address to the Master Appliance.

  1. Click on VM and Templates.
  2. Select the UAG-HA1 VM.
  3. Click on View all 3 IP addresses.
  4. The Virtual IP address was assigned to the UAG-HA1 VM, the Master appliance.

NOTE - If UAG-HA1 was still selected from when you last left vSphere, you may need to refresh the page to see the IP Addresses update properly.

Perform the same steps to view the IP addresses ofthe UAG-HA2 VM. Notice it still has two IP address, as this appliance is set as the Backup appliance on the High Availability stack.


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