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Error message when you try to overlay an Exchange calendar in a SharePoint page on a server that is running SharePoint Server 2010 or SharePoint Foundation 2010: "Could not establish trust relationship for the SSL/TLS secure channel with authority"

Article ID: 982982 - View products that this article applies to.

SYMPTOMS

Consider the following scenario:

You have Microsoft SharePoint Server 2010 or Microsoft SharePoint Foundation 2010 installed.
You have a SharePoint site or application that overlays the Microsoft Exchange calendar together with the calendar on a SharePoint page.

In this scenario, free/busy information is not displayed from the Exchange calendar. Additionally, you receive the following error message:

Could not establish trust relationship for the SSL/TLS secure channel with authority 'Exchange_mail_server'. (87ed56e6-5b15-41ad-8672-72afdeb45460)

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CAUSE

This issue occurs because SharePoint Server 2010 and SharePoint Foundation 2010 have their own certificate store that misses the certificate chain for the Exchange server.

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WORKAROUND

To work around this issue, use one of the following methods:

Method 1: Install the certificate to the local certificate store of the application pool's account in SharePoint
1. Log on to the SharePoint web-frontend server by using the SharePoint application pool's account.
2. Open the certificate file of the root certification authority (CA) for the Exchange server.
3. Import the certificate to Trusted Root Certification Authorities.
Note If you have multiple web-frontend servers, repeat these steps on each web-frontend server.
Method 2: Install the certificate to the SharePoint certificate store
1. Open SharePoint 2010 Central Administration.
2. Click Security, and then click Manage trust.
3. Add a certificate file of the root certification authority (CA) for the Exchange server.