Exchange 2010 SP1 Activesync & OWA Authentication - Intermittent Problem
Posted on 2012-09-12
About 2 weeks ago, we started having problems with Our Exchange 2010 (SP1, RU6) server in that ActiveSync and OWA stop working. What happens is that all of the sudden, users get an 'invalid password' message on their ActiveSync device and can no longer receive/send any new mail. Likewise, when this starts happening, OWA exhibits similar behavior...no matter what account you try to login to OWA with, it comes back and says invalid credentials. I suspect that Outlook Anywhere (RPC over HTTPS) is also affected, although I have not received complaints directly on this.
Rebooting the server instantly fixes the problem for anywhere from 1-3 days and then the problem comes back. It's obviously related to IIS as internal MAPI communications and SMTP continue to work just fine the entire time.
No updates have been applied to the server that correspond to when the problem started happening.
I'm pulling my hair out on this one though. Any suggestions/ideas would be greatly apprecaited!