The Mediation Server must be configured with a server certificate in order to connect to other Office Communications Server servers. The certificate is usually configured in the Certificate Wizard when you deploy the Mediation Server. If you want to change the certificate, you can do either of the following:

Any modifications you make are only applied to future connections—existing connections continue to use the old certificate as long as the connection continues.

To configure a certificate for a Mediation Server

  1. Open the Office Communications Server 2007 R2 snap-in.

  2. In the console tree, expand the forest node, expand Mediation Servers, right-click the Mediation Server for which you want to configure a certificate, and then click Properties.

  3. On the Certificatetab, do one of the following:

    • To delete the current certificate, click Delete Certificate, and then click OK.

    • To assign a certificate to the Mediation Server, click Select Certificate. In the Select Certificatedialog box, in the list of certificates, click the certificate you want to use, and then click OKtwice.