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Since we upgraded the code on the F5 Big-IP LTM running code 11.1.0 HF2 to a newer HF3+, certain Apple mail clients stop working.

So far we have identified 2 mail clients having connectivity issue with OA for Exchange2010:

   OS X Mountain Lion native mail client

   iMExchange 2 @


According to F5 engineers, they say that the issue is with the mail clients, not their code.

So they suggest us to contact Apple instead.  We are opening a ticket with Apple…


Has anyone else seen this problem, and have you found a fix?


Thank you,



Network Infrastructure & Telecommunications

Office of Technology Services (OTS)

University of Baltimore


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