Question : Activesync will not sync with my Exchange server Can not obtain a valid certificate error

I have been working on setting up Active Sync 4.2 to work on a Windows 2k Pro workstation. I am trying to sync an Alltel Motorola Q phone. I purchased a certificate from GoDaddy. I can browse to the /exchange site with the certificate, and log in without a problem. I cannot browse to the /oma site with the certificate. When I browse to the site from my web browser I get this error after I authenticate A System error has occurred while processing your request. Please try again. If the problem persists, contact your administrator. When I browse to the /oma site on my single Exchange 03 Standard server, running Windows Server 03 Standard using this url  https://computername.domainname.com I could not navigate to the site. In event viewer on my Exchange server I received the error listed below.

Event ID: 1503
An unknown error occurred while processing the current request:
Message: The remote server returned an error: (403) Forbidden.
Source: Microsoft.Exchange.OMA.ExchangeDataProvider
Stack trace:
   at Microsoft.Exchange.OMA.ExchangeDataProvider.OmaWebRequest.GetRequestStream()
   at Microsoft.Exchange.OMA.ExchangeDataProvider.ExchangeServices.GetSpecialFolders()
   at Microsoft.Exchange.OMA.ExchangeDataProvider.ExchangeServices..ctor(UserInfo user)

Message: Exception has been thrown by the target of an invocation.
Source: mscorlib
Stack trace:
   at System.Reflection.RuntimeConstructorInfo.InternalInvoke(BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture, Boolean isBinderDefault)
   at System.Reflection.RuntimeConstructorInfo.Invoke(BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
   at System.RuntimeType.CreateInstanceImpl(BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes)
   at System.Activator.CreateInstance(Type type, BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes)
   at Microsoft.Exchange.OMA.UserInterface.Global.Session_Start(Object sender, EventArgs e)

Message: Exception of type Microsoft.Exchange.OMA.DataProviderInterface.ProviderException was thrown.
EventMessage:
UserMessage: A System error has occurred while processing your request. Please try again. If the problem persists, contact your administrator.
Source: Microsoft.Exchange.OMA.UserInterface
Stack trace:
   at Microsoft.Exchange.OMA.UserInterface.Global.Session_Start(Object sender, EventArgs e)
   at System.Web.SessionState.SessionStateModule.RaiseOnStart(EventArgs e)
   at System.Web.SessionState.SessionStateModule.CompleteAcquireState()
   at System.Web.SessionState.SessionStateModule.BeginAcquireState(Object source, EventArgs e, AsyncCallback cb, Object extraData)
   at System.Web.AsyncEventExecutionStep.System.Web.HttpApplication+IExecutionStep.Execute()
   at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)


For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.

Ive read several post on this issue, and believe I may now have two issues. I am pretty sure that kb 817379 (http://support.microsoft.com/Default.aspx?kbid=817379) is something I need to go through since my Exchange server is not a front end server. After I can sync without requiring a ssl certificate I complete the steps for accessing /oma through https for a environment that is not using a front end Exchange server listed in the previously mentioned kb article. To verify that this was an issue I removed the ssl requirements on my site through IIS. I was able to navigate to the /oma site using my web browser, but I still could not sync my phone. When I try to sync my phone using Active Sync I still get the error listed below:
Can not obtain a valid certificate. To try again, please disconnect and reconnect your device to a pc on the corporate network. If this problem persists, please contact your administrator. Support Code: 85030028

I made sure that Enable OMA is checked. I have also unchecked the Direct Push over HTTP(s) option in ESM on the Exchange server. I have gone through the Active Sync settings several times and everything looks correct. In select server in my Active Sync settings I have choosen www.url.com as the server, and have even tried the Exchange server IP address, and put /exchange and /oma in the url. I will give maximum points to someone that can help me identify the cause of why I cannot use Active Sync to sync the phone even when ssl certificate is not required. Thank you in advance.

Answer : Activesync will not sync with my Exchange server Can not obtain a valid certificate error

Have you installed the certificate on your Windows desktop?  have you installed the certificate on your Q phone?