Event 1033, MSExchangeActiveSync Warning

Hi there,

We are getting MSexchangeActiveSync warning messages -event ID 1033 on Exchange 2013 CU3. Details can be seen below. As we are in the process of mailbox migration from exch 2007 to 2013, we are also noticing activesync issue once a while. I couldn't come across anything regarding to warning message and I'm curious if this is somehow link to activesync issue that we are noticing?

"The setting SupportedIPMTypes in the Web.Config file was missing. Using default value of System.Collections.Generic,List`1[System.String]."

PS: Restarting activesync pool helps and restart the activesync connections as it is mentioned on the link.

http://social.technet.microsoft.com/Forums/exchange/en-US/2c52ab78-a6b2-4fd0-8239-808b67a6d427/event-logs-repeating-event-id-5011-was-and-6002-ping-of-mdb?forum=exchangesvrmobility

Thanks,

Cem