Event Id 1040 on Exchange Servers

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Frequent Visitor

In our environment we have 3 exchange mailbox servers 2 in our main office and 1 in a secondary site. We have 3 CAS servers behind a WNLB. Seems like for a few months now we have been having activesync issues. high CPU usage on the IIS process. I am seeing the event 1040 on the exchange servers. In trying to troubleshot I found this article  and I checked my setting and they are the same.  I asked my network admin about the firewall setting and he told me that the were no time values on the firewall. Any help appreciated. Tanks. 

https://social.technet.microsoft.com/wiki/contents/articles/35919.event-id-1040-on-exchange-servers....

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