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Exchange ActiveSync returned an HTTP 500 response.

I get the following message when I use www.testexchangeconnectivity.com test, I've seen this before but never was able to resolve it.

Help!!!
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Daniel Forrester
Asked:
Daniel Forrester
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Daniel ForresterDirectorAuthor Commented:
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Shabarinath RamadasanInfrastructure ArchitectCommented:
You may experience this error if you have an Exchange 2003 server without a front-end server and are using Secure Sockets Layer (SSL) or forms-based authentication. If this is the case, see Microsoft Knowledge Base article, "Exchange ActiveSync and Outlook Mobile Access errors occur when SSL or forms-based authentication is required for Exchange Server 2003" (http://go.microsoft.com/fwlink/?linkid=3052&kbid=817379).

In Exchange 2003, ActiveSync requires Kerberos authentication to work properly between the front-end and the back-end servers. Some common reasons for Kerberos authentication in IIS not working are:

    Integrated Windows Authentication may not be enabled on the back-end server's "/Exchange" virtual directory.
    The affected users may be members of too many groups causing their user tokens to be larger than the maximum allowed size.


Check this link for more details.

http://technet.microsoft.com/en-us/library/dd439375%28EXCHG.80%29.aspx

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Daniel ForresterDirectorAuthor Commented:
As I have an SBS server I can't use method 1, method 2 makes no difference to the situation.
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Satya PathakLead Technical ConsultantCommented:
I would suggest you to please go through ..

http://support.microsoft.com/kb/886346
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Daniel ForresterDirectorAuthor Commented:
Made no difference, I've had this before and had to reinstall, I really don't want to do that again!!
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