--By: Neil Barkhina
Installing FAST Search for SharePoint is by no means an easy feat, and after going through this long and arduous task you can imagine my dismay at finding that I couldn’t view document previews in the FAST Search Center. I thought I did every step exactly the way it was described on MSDN, and I was hoping to be rewarded with a wonderful search results experience. But instead I was rewarded with an annoying JavaScript error in the bottom left corner of Internet Explorer:

I tried many different things, but in the end I realized it had to do with my site running in SSL. The interesting thing is it seems the error only affects document previews, whereas all other features of FAST are unaffected. If you actually look at the JavaScript error, you will see one of two messages:
Message: Syntax error
Line: 2
Char: 1
Code: 0
URI: https://sps.gig-werks.com/Neil/_vti_bin/wacproxy.ashx?redirect=https%3A%2F%2Fsps.gig-werks.com%2FNeil%2F_layouts%2FWordViewer.aspx%3Fid%3D%2FNeil%2FShared%2520Documents%2Fbeing%2520a%2520developer.docx%26DefaultItemOpen%3D1&spsite=https%3A%2F%2Fsps.gig-werks.com%2FNeil&docType=docx&zone=undefined&callbackFunctionName=DelegateFn_SRB_g_67ad5588_cf32_489d_8baa_538e1d3177df_1
Or it may look something like this:
Message: Syntax error
Line: 2
Char: 1
Code: 0
URI: https://sps.gig-werks.com/dev/_layouts/error.aspx?ErrorText=Object%20reference%20not%20set%20to%20an%20instance%20of%20an%20object%2E
If you get the WACPROXY.ASHX or Object Reference error, chances are it is related to your site running on SSL. Now the strange thing is I imported the certificate into IIS and set the binding for my site, however what I didn’t do is upload the certificate to the SharePoint Manage Trusts area. Now remember, this has to be the certificate you purchased from your certificate dealer for public facing websites. Go to Central Administration -> Security -> Manage trust:

Then click on New to create a new trust. Fill out the name and browse for the certificate.

Also, just to be safe you should import the cert on your SharePoint FE Server into the Trusted Root Certification Authorities folder. After you did this you should finally be able to see document previews, Enjoy!

--By: Neil Barkhina