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Error message in the Online Services Directory Synchronization Tool in Forefront Online Protection for Exchange: "A non recoverable error has occurred: System.Security.AuthenticationException"
Article ID: 2005947 - View products that this article applies to.
In Microsoft Forefront Online Protection for Exchange, the Online Services Directory Synchronization Tool (DST) generates the following error message:
A non recoverable error has occurred: System.Security.AuthenticationException
This problem occurs because another application is reserving port 8080 on the system on which the DST is installed.
To work around this issue, perform the following steps: