We are getting several errors in the ManagedAvailability Monitoring event log on our Exchange server that appear to somewhat related - all appear to be 401 type errors, and unauthorized. Everything seems to be working ok, but we are not fully live with this server yet and I am hoping someone may have some thoughts on what these are about - I saw the MS support pages about this, but they didn't seem specific to these errors.  I updated to cu8 a couple weeks ago, but the errors predate that by a few months - I just noticed them this week. The errors are related to EWS, EWS.Proxy, AutoDiscover.Proxy, ActiveSync, ActiveSync.Proxy, OAB.Proxy, OutlookMapi.Proxy, Outlook.Proxy, OWA.Maintenance.Workitem, client submission probe on port 127.0.0.1:587. Not sure what is going on here, but all seem related with unauthorized or 401 errors. I am coming from Exchange 2007, but 2007 is in a different domain, and I am just exporting the psts and importing them into brand new user accounts - pretty standard install of Exchange Standard. Interestingly, the errors will occur for days at a time then have a few hours or a day or two of non errors. There aren't any other system errors to speak of on the system, except I am also getting a some errors in the general system log about Microsoft Exchange Diagnostics service terminating unexpectedly.  Hope someone has some thoughts on these errors - making me a little uneasy about going live - supposed to be this Friday evening.  Thanks in advance for the help!

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• Edited by gmwood 9 hours 59 minutes ago

Possible solution found - I had added some upn's to our domain and I noticed that the errors indicated that the healthmailboxes were trying to log on using a upn that did not match the default upn for the account. I changed this for two of the mailboxes and noticed that several of the errors have gone away so far - rebooted and trying again and will update the post - if anyone has any thoughts on this, please post!

Thanks, for the help.