SharePoint 2010 problems with SSL Certificate

In our case some of the webparts displayed on SharePoint 2010 Portal Site having errors. These error occur only if we access the portal site throw a secured HTTPS url.
If we access it with the normal http url, the problems doesn’t occur.

When I had a look into the Eventlog of the SharePoint 2010 server i found some hints on the problem:

An operation failed because the following certificate has validation errors:
Subject Name: CN=*.hagenberg-software.at, OU=Domain Control Validated – …,
OU=…, OU=…, O=*.hagenberg-software.at, C=AT,
SERIALNUMBER=…
Issuer Name: CN=…
CA,
O=”GeoTrust, Inc.”, C=US\nThumbprint: …
Errors: The root of the certificate chain is not a trusted root authority..

The solution to fix this issue is to add the root certificates of the SSL certificate to the SharePoint 2010:

1. Open the SharePoint 2010 Central Administration
2. Open the ‘Manage Trust’ section under the ‘Security’ Tab
   
3. Add the SSL Certificate and all the Root Certificates of the certificate chain.
   The best way to import the certificates is to store them in base-64 files with the file extension *.cer
4. Now check if the SharePoint 2010 Portal is working via the Https url

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