Anyone knows, what is this error stating? Event Type:ErrorEvent Source:MSExchange Web ServicesEvent Category:Core Event ID:12Date:10/31/2008Time:6:20:01 AMUser:N/AComputer:contoso Description:Caller S-1-5-20 attempted to proxy EWS traffic to contoso. This failed because the calling AD account does not have the necessary access rights to send EWS proxy traffic to contoso For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.Sivakumar

Hi, This is failed because the calling AD account does not have the necessary access right to send EWS proxy traffic. What is your Exchange Server role installed, is CAS proxy configured in your scenario? Whether all the AD account is in your AD environment? Please try to use this account to logon outlook, OWA, or other client access tool and then figure out after what action this event would be generated. Besides, please follow the article below to check the settings on EWS virtual directory Default settings for Exchange-related virtual directories in Exchange Server 2007 http://msexchangeteam.com/archive/2008/02/01/447989.aspx More information need for further troubleshooting. 1. Please try to check event log from DC. 2. Please try to use ExBPA to have a health scan and check the report. 3. Is there any CAS publishing rule have been done? 4. Is there any proxy setting? Article share with you in case you will need: Understanding Proxying and Redirection http://technet.microsoft.com/en-us/library/bb310763.aspx Best regards, Xiu

Thanks Xiu..I am checking the same, what you suggested. I will update you the status soon. Mean time, do you have idea about the belwo things; 1.) I need a powershell script that finds all SIP URI addresses and Primary SMTP addresses for each user. SoI can compare that they are the same. 2.) How to grant read only access on a mailbox.? Regards/ Siva

Whether all the AD account is in your AD environment? I amnot sure what AD account you are talking about?

Hello, I have exactly the same problem. Yesterday, everything was working fine. We are installing a new site in another country so, in our Active Directory, we deleted the default site and create two new sites with our domain controller, networks, link between sites... After this modification, everything was still working fine (exchange server, owa...) except blackberry communication with exchange server. Blackberry users can't receive mail anymore. I think that we have problem only with web services proxying (/EWS) because webmail is working fine. We get exactly the same error : Event Type: Error Event Source: MSExchange Web Services Event Category: Core Event ID: 12 Date: 04/11/2008 Time: 01:11:18 User: N/A Computer: SERVER-04 Description: Caller S-1-5-20 attempted to proxy EWS traffic to SERVER-04. This failed because the calling AD account does not have the necessary access rights to send EWS proxy traffic to SERVER-04 I think there is somehting with ou site configuration but I can't understand what. Thanks for your help, Zak.

Hi Siva!We encountered the same problem, while trying create appointments via EWS.did you find a solution?Thanks.Amit.