So the Exchange servers have all been patched with the latest CU and the latest november security updates, right? I tried searched around but so far haven't seen reports about a similar issue after installing the recent updates, but I'll keep an eye on it and post back if I see any similar threads. If possible, could you remove all sensitive information involved and then share some more details about the error message and the event log so that we can see if more clues can be found? It's also logged to the event log (event 1309).īy this, do you mean when Exchange Activesync stops working, users fail to accessing OWA as well with the "System.OutOfMemoryException" error and Event 1309 in the event log? Hi the moment that it failed when we go to that page (while logged in on owa), we see a System.OutOfMemoryException. Unfortunately we cannot find anything about this online so I'm hoping someone can help us with this.īas office-exchange-server-administration office-exchange-server-connectivity office-exchange-server-itpro Since this just started a few weeks ago, I think the issue started with the last CU or with the october or november security updates. The only way we can fix this is by restarting the whole server, but we're just waiting for the problem to occur again. iisreset or restarting the sync apppool doesn't help. It's also logged to the event log (event 1309).Īt the moment of the issue, there is more than enough memory available. We are monitoring this by testing the url: - if it returns a 401 Unauthorized error then it works fine, else it failed.Īt the moment that it failed when we go to that page (while logged in on owa), we see a System.OutOfMemoryException. However, because the activesync stops working, the mail on mobile devices doesn't work anymore. There is also nothing wrong with the mailflow. We didn't see this happening on a 2013 Exchange server (yet).Īt the time that the issue occurs, everything except activesync still works properly. Sometimes this happens out of nothing to one server at a random time, and sometimes we see 10 servers failing just after eachother in a timespan of a few hours. Since a few weeks we regularly see the activesync is broken on a server. We manage a lot of Exchange 20 on-premise servers.
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