Hi, I have setup an Exchange server on SBS2008. Everything was working until I installed the update rollup 4 for Exchange 2007 SP1. I was unable to authenticate to the server. I tried to troubleshoot by using https://autodiscover.domain.com/autodiscover/autodiscover.xml, or https://webmail.domain.com/EWS/Exchange.asmx They prompt me for Username and password, but doesn't seem to authenticate after I key in the correct Username and Password, and keeps on prompting me instead. Exchange version: Exchange 2007 SP1 Update Rollup 4 Is this a problem with the update rollup? I have the testexchangeconnectivity.com error message as well. Attempting to send an Autodiscover POST request to potential Autodiscover URLs. Autodiscover settings weren't obtained when the Autodiscover POST request was sent. Test Steps ExRCA is attempting to retrieve an XML Autodiscover response from URL https://autodiscover.domain.com/AutoDiscover/AutoDiscover.xml for user test@domain.com. ExRCA failed to obtain an Autodiscover XML response. Additional Details An HTTP 401 Unauthorized response was received from the remote Unknown server. This is usually the result of an incorrect username or password. If you are attempting to log onto an Office 365 service, ensure you are using your full User Principal Name (UPN). Any help will be much appreciated. Thank you.

Check the setting of reverese proxy Nelson N Exchange 2003|2007|2010

Check the setting of reverese proxy Nelson N Exchange 2003|2007|2010

it looks like security exception calling WCF WebService that requires kerberos authentication from silverlight app. Try replacing itNelson N Exchange 2003|2007|2010

it looks like security exception calling WCF WebService that requires kerberos authentication from silverlight app. Try replacing itNelson N Exchange 2003|2007|2010

Check the setting of reverese proxy Nelson N Exchange 2003|2007|2010

it looks like security exception calling WCF WebService that requires kerberos authentication from silverlight app. Try replacing itNelson N Exchange 2003|2007|2010

Exchange 2007 SP1 is no longer supported. Please try upgrade your Exchange to SP3 and verify again.Regards, Konrad Sagala, MCT, MCSE+M, MCITP: Exchange 2007/2010

Hi, It seems the SP has not been installed properly, I would suggest you apply the latest Exchange 2007 hotfix: http://technet.microsoft.com/en-us/library/ee221180(EXCHG.80).aspx If the issue continues, try in the CAS server via Https://localhost/autodiscover/autodiscover.xmlto see if this works. And check the permission configuration according to: http://blogs.technet.com/b/exchange/archive/2008/02/01/3404755.aspx. Hope it is helpful. Fiona Liao TechNet Community Support

Thanks everyone for the helpful suggestions and comments. This case has been resolved. Apparently the SP1 Update Rollup 4 was the cause of this. After installing the Exchange 2007 Server Service Pack 3, everything is working fine again. Apple Mail is supported as well! Thanks again! :)