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"Exchange ActiveSync device requests for your users are being blocked." in Event Viewer Logs

I am seeing this event viewer item several times each day on my Exchange 2010 SP3 CAS servers.  The CAS servers (3) are sitting behind an F5 Big IP load balancer.  The SSL cert is on the F5 VIP.   There is no firewall active on any of the CAS servers.

Activesync is working fine.  Smartphones are syncing fine.     I'm just curious if there is a way to stop this error in the event viewer.

Log Name:      Application
Source:        MSExchange ActiveSync
Date:          9/20/2016 7:38:43 AM
Event ID:      1100
Task Category: Requests
Level:         Error
Keywords:      Classic
User:          N/A
Computer:      DWTEXCAS01.DWT.com
Exchange ActiveSync device requests for your users are being blocked. This problem frequently occurs when the HTTP OPTIONS method request isn't allowed by the firewall. Please check the firewall that filters requests in front of your Client Access server and the Microsoft-Server-ActiveSync virtual directory.
Dave Zuver
Dave Zuver
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2 Solutions
Randy DownsOWNERCommented:
looks like the error will remain

active sync test still fails with the same error so I can only assume that the test isn't in some way compatible with exchange 2010 which has been slightly unhelpful.
Are you doing any HTTP inspection on the F5 or elsewhere on the path to the CAS servers from the Internet?

Do you have any session timeouts set on the F5 or elsewhere on the path to the CAS servers from the Internet?
Randy DownsOWNERCommented:
awarded points
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