403 forbidden errors after a cert install

On one of our applications, one of the certs was expiring so we installed a new one to replace it. If we reverted back to the older cert, the error went away. However the old cert is now expired. Any suggestions.

Now we are getting these alerts.


Event Type:      Error
Event Source:      Office Communications Server 2007 Speech Server
Event Category:      Speech Application
Event ID:      29025
Date:            2/19/2011
Time:            3:09:25 PM
User:            N/A
Computer:      Bobby1
Description:
Application Error 2701:  ERROR: Got error on searchCustomer by ani/tn (12345678) request. Error Code: 500; error msg: System.ServiceModel.Security.MessageSecurityException: The HTTP request was forbidden with client authentication scheme 'Anonymous'. ---> System.Net.WebException: The remote server returned an error: (403) Forbidden.
   at System.Net.HttpWebRequest.EndGetResponse(IAsyncResult asyncResult)
   at System.ServiceModel.Channels.HttpChannelFactory.HttpRequestChannel.HttpChannelAsyncRequest.CompleteGetResponse(IAsyncResult result)
   --- End of inner exception stack trace ---

Server stack trace:
   at System.ServiceModel.AsyncResult.End[TAsyncResult](IAsyncResult result)
   at System.ServiceModel.Channels.ServiceChannel.SendAsyncResult.End(SendAsyncResult result)
   at System.ServiceModel.Channels.ServiceChannel.EndCall(String action, Object[] outs, IAsyncResult result)
   at System.ServiceModel.Channels.ServiceChannelProxy.InvokeEndService(IMethodCallMessage methodCall, ProxyOperationRuntime operation)

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