Explanation/Reference:
Explanation:
Certificate needs to be installed to IIS, Bindings modifies and wsusutil run.
First we need to request a certificate for the WSUSweb site, so open IIS, click the server name, then

open Server Certificates.On the Actions pane click Create Domain Certificate.
To add the signing certificate to the WSUS Web site in IIS 7.0On the WSUS server, open Internet

Information Services(IIS) Manager. Expand Sites, right-click the WSUS Web site, and then click Edit Bindings. In the Site Binding dialog box, select the https binding, and click Edit to open the Edit Site Binding dialog box.Select the appropriate Web server certificate in the SSL certificate box, and then click OK. Click Close to exit the Site Bindings dialog box, and then click OK to close Internet Information Services (IIS) Manager.
WSUSUtil.exe configure ssl<FQDN of the software update point site system> (the name in your

certificate)WSUSUtil.exe configure ssl<Intranet FQDN of the software update point site system>.
The next step is to point your clients to the correct url, by modifying the existing GPO or creating a new

one. Open the policy Specify intranet Microsoft update service location and type the new url in the form
https://YourWSUSserver.
The gpupdate /force command will just download all the GPO's and re-apply them to the client, it won't force the client to check for updates. For that you need to use wuauclt /resetautorization /detectnow followed by wuauclt /reportnow References:
http://technet.microsoft.com/en-us/library/bb680861.aspx
http://technet.microsoft.com/en-us/library/bb633246.aspx
http://www.vkernel.ro/blog/configure-wsus-to-use-ssl