Symptoms

Mobile devices cannot connect to Exchange Server 2013 by using ActiveSync. Additionally, they cannot sync email at random intervals. In this situation, you receive the following error message:


We're having problem connecting to< server name>. contact a support person or your service providerĀ 
Error Code: 86000C09


Resolution

To resolve this issue, installĀ Cumulative Update 10 for Exchange Server 2013.

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