the received certificate has expired

1. Navigate to the virtual root Exadmin in IIS.
2. Right-click Exadmin, click Properties, and then click Directory Security.
3. In the Secure Communications section, click Edit.
4. Clear the Require secure channel (SSL) checkbox.
5. If the Require 128-bit encryption checkbox is selected and is greyed out, perform these steps:
   1. Select Require secure channel (SSL).
   2. Clear Require 128-bit encryption.
   3. Clear Require secure channel (SSL).
6. Launch the ADSI Edit tool from the Windows Support Tools. For more information about using the ADSI tool, see ADSI Edit (adsiedit.msc).
7. In the left pane, click Configuration, and then click each of the following to expand:CN=ConfigurationCN=ServicesCN=Microsoft ExchangeCN=CN=Administrative Groups

   CN=First Administrative Group

   CN=Servers

   CN=Protocols

   CN=HTTP

   CN=1

   CN=Exadmin

8. Right-click CN=Exadmin, and then click Properties.
9. In the list of attributes, scroll down to msExchSecureBindings, select it, and then click Edit.
10. Select the entry :443:, click Remove, and then click OK.
11. Click Apply, then click OK.
12. Exit ADSI Edit.
13. Close and reopen Exchange System Manager.

This article is given as is and I will not be held liable for anything that happens to your system.