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With passthru security the end user get a pop-up warning about accepting the self signed certifcate from the virtual ip 188.8.131.52.
Is there a way to replace the certificate with a trusted public certificate?
There's a page on the Cisco Support Wiki which addresses this. http://tinyurl.com/5bho6s
You can disable https: on the controller. This will eliminate that windows pop-up warning. You need to reboot the controller for change to take effect.
Or you can install an actual SSL certificate on the controller.
For ease of administration I went with option 1 so I did not have to worry about renewing the certificate every year.