How do I update the KEMP LoadMaster Firmware?

To update the LoadMaster firmware, follow the steps below in the Web User Interface (WUI).

To obtain the latest firmware please go to our Downloads Section located here.

Step 1) Back up the LoadMaster

KEMP recommends taking a backup of the LoadMaster as a restore point which can be used if needed. To back up the LoadMaster, go to System Configuration > System Administration > Backup/Restore. Click Create Backup File.

Certificates need to be backed up separately. For instructions on how to back up certificates refer to the following article: How do I back up certificates?.

Alternately, you can take a snapshot of the virtual machine if you have a Virtual LoadMaster.

Step 2) Download the patch

  1. Log into the KEMP Support Center.
  2. Click Downloads.
  3. Select the appropriate LoadMaster type/model.
  4. Download the appropriate firmware release.

Step 3) Install the patch

  1. In the WUI, go to System Configuration > System Administration > Update Software.
  2. Click Choose File.
  3. Browse to and select the patch file.
  4. Click Update Machine.
  5. Follow the prompts to apply the patch.

Step 4) Reboot

You will be prompted to reboot the LoadMaster. Please do so.

Step 5) Clear the browser cache

After patching, if there are any problems using the WUI, please clear the browser cache and restart the browser.

Step 6) Repeat the process for the partner unit (if applicable)

LoadMaster Highly Available (HA) pairs require each unit be patched separately. The overall process is as follows:

  1. Patch the active unit via the shared IP address.
  2. Reboot the upgraded unit.
  3. When the reboot occurs,  the active role will move to the standby unit.
  4. Check to ensure the patched unit is back online (try to access the LoadMaster administrative IP address, which usually the eth0 IP address).
  5. Now the standby unit will be active. Patch the new active unit.
  6. Reboot the upgraded unit.
Was this article helpful?

34 out of 37 found this helpful



Thanks for sharing the article.


I use a HA pair. This was my upgrade path:
1. Update the active VLM via shared IP.
2. Reboot.
3. As soon as the upgraded VLM came back up, it became active again. I didnt do a thing.
4. Then I upgraded the standby unit via its own IP: Local administration - Update Software.

Philip O'Connor

Hello, Thank you for sharing your experience.
On the LoadMaster WUI under HA Parameters, you might have had the option Switch to Preferred Server enabled. This is normally not enabled by default. Changing it to no Preferred Host before preforming the update will prevent the unit for becoming master again. However you might wish to return to this setting after the upgrade is completed.


One question. Will the websites and exchange still be available while performing the update on the active VLM?

Edited by e.van.kruiselbergen

when I go to "software update", it shows "license disallows any further software..."


If you are using a free version for development, you cannot update you would have to backup and start again?


How long would an update on a single machine take?
We have VLM-2000 with has currently the 7.1-30-75 firmware.


Hello how do I find which model I have..
on home the appliance model is empty :

Licensed until: unlimited
Support Level:
Support Until: none
License Type:
License Status: Single Perm
Appliance Model: