Exchange ActiveSync returned an HTTP 500 response.

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

Daniel ForresterDirectorAsked:
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Daniel ForresterDirectorAuthor Commented:
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" (

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.


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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.
Satya PathakLead Technical ConsultantCommented:
I would suggest you to please go through ..
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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