Exchange Active Sync Basic Authenctication Cert

Question

Hello,

I am using SCEP server on Windows 2008 Enterprise R2 SP1. The SCEP server successfully communicates with mobile devices and is able to generate certificates on them. However, although I can select the certificate and use basic authentication for accessing Outlook Web Access (OWA), I encounter a 500 error code in the server logs even when I correctly configure Active Sync basic authentication.

Here are the relevant log entries:
2010-08-12 23:53:39 ip_address POST /PowerShell clientApplication=EMC;ExchClientVer=14.1.218.6;PSVersion=2.0 80 CONTOSO\Administrator ip_address Microsoft+WinRM+Client 500 0 0 179998

2010-08-12 23:54:30 ip_address POST /powershell serializationLevel=Full;ExchClientVer=14.1.218.6;PSVersion=2.0 80 CONTOSO\Administrator ip_address Microsoft+WinRM+Client 500 0 0 179994

2010-08-12 23:54:36 ip_address POST /PowerShell serializationLevel=Full;clientApplication=EMC;ExchClientVer=14.1.218.6;PSVersion=2.0 80 CONTOSO\Administrator ip_address Microsoft+WinRM+Client 500 0 0 179996

2010-08-12 23:56:39 ip_address POST /PowerShell clientApplication=EMC;ExchClientVer=14.1.218.6;PSVersion=2.0 80 CONTOSO\Administrator ip_address Microsoft+WinRM+Client 500 0 0 179996

I have been unable to identify the solution or the source of this issue.

Any assistance in resolving this would be greatly appreciated.

Thank you.