WebDAV notifications not working Exchange 2003 RRS feed

  • Question

  • I have a service that subscribes to a predefined list of mailboxes and receives notifications on a callback when something in that folder changes.

    All standard stuff except it stopped working a while ago and at first I suspected changes to the code (as there were known bugs being fixed at the time), however I've ruled this out;
    one particular production environment failed and the software was never updated - and it previously did work.

    So my guess is either the Exchange configuration was changed (although I find it hard to belive that most of our clients did this same breaking change) or a KB hotfix tightened some security or did some other change that then caused the failure.

    The symptom is that at some point from the first subscripton and a renewal, no further notifications are sent back to the service.
    There are no exceptions being trapped or otherwise in my code. Just that the listener stops receiving packets.

    The IIS web logs are useless (as only the initial SUBSCRIBE verbs are logged) and I have no access to the production servers to run any network monitoring tools.

    Unable to reproduce on our own internal server either.

    Does anyone have a hint at why this might be happening, or have a similar experience?


    Many thanks.

    Wednesday, August 24, 2011 10:42 PM