Info : Duet 1.5 Request Handler Resources

The goal of this post is to provide a quick list of the important Duet 1.5 Request Handler issues and updates that need to be understood when working with the Request Handler. Duet 1.5 Request Handler changes in the November 2009 hotfix package SAP changes with regards to Request Handler timeouts Windows Server 2008 and…

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Duet 1.5 Request Handler changes in the November 2009 hotfix package

In an Exchange FE/BE configuration the Front End server does not have any mailbox stores on it and generally these servers only have Basic Authentication with SSL enabled. This poses a problem for the Duet 1.5 Request Handler and how it uses WebDAV to communicate to the Exchange server, since it’s unable to authenticate using…

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SAP changes with regards to Request Handler timeouts

Problem: Problems with Request Handler timeouts trying to send large amounts of control messages in rapid succession. Cause: There were some HTTP 503 response codes ("Service unavailable") propagated from Exchange via RH to the SAP J2EE Item Handler. Temporary 503s can happen if Exchange is under high load, and the messages that were being attempted…

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Windows Server 2008 and the Duet 1.5 Request Handler

Currently the Duet 1.5 Request handler is not supported being installed on Windows 2008 server (x86 or x64). Due to the various changes that were made in Windows Server 2008 to IIS (now IIS 7.0), we cannot support the Request Handler on Windows Server 2008.  We do, however, currently have plans to make the Request…

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HTTP 401.5 errors with the Duet 1.5 Request Handler

Problem: When sending large (>25k) control messages, these messages do not get sent to the clients, and they become orphaned in the Request Handler’s “Drafts” folder.  Reviewing the IIS logs on the Exchange server shows a corresponding series of PROPPATCH attempts resulting in 401.5 errors. Below is what you might see in the IIS logs…

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