WSUS not working properly with SSL

First I used our wildcard SSL from RapidSSL, but I have read something about WSUS not being to happy about wildcard certificates.

Correct. The SSL certificate must be issued in the canonical name of the WSUS server. In the case where you have an Internet-published server for clients, that may require you to [a] implement multiple certificates or, [b] configure multiple identities on a single SSL certificate.

Yes - I have installed the certificate in order to choose it in the IIS bindings. And also the intermediate certificate from the CA.

And the ROOT certificate?

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Lawrence Garvin, M.S., MCSA, MCITP:EA, MCDBA
SolarWinds Head Geek
Microsoft MVP - Software Packaging, Deployment & Servicing (2005-2014)
My MVP Profile: http://mvp.microsoft.com/en-us/mvp/Lawrence%20R%20Garvin-32101
http://www.solarwinds.com/gotmicrosoft
The views expressed on this post are mine and do not necessarily reflect the views of SolarWinds.