Tuesday 3 March 2015

How to enable SSL offloading on a Kemp Load Balancer

I love the 2 Kemp Load balancers that we have at work.  As well as the obvious job of directing traffic to multiple application front-ends it can also perform SSL offloading.

This means that we can have a single portal through which to manage our SSL certificates rather than having to update on individual IIS computers.

To start you need an SSL certificate and any intermediate certificate that is required.

Logon to the Kemp load balancer
Select Certificates > SSL Certificates
Click "Import Certificate"
Click "Browse" to select your certificates
Fill in the Pass Phrase and add a Certificate Identifier (this can be anything as its a friendly name that you can use to identify it in the web UI)

You can now add Virtual Services to the assigned list for the certificate - you need to make sure that your VirtualService listens on port 443 and you might want to disable SSL on the real servers and have the load balancer and the real server communicate over port 80 without SSL unless you are concerned about the security of your internal network communications.

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