Has anyone actually found a fix for this?
I have the issue only on the Iphone6 running IOS 8.1.2 or 8.1.3
I also have Iphone 5's on the network that are fine running the same revision.
I am not an Apple guy, so if anyone has any idea what to check on the device itself, we might be able to figure this out..
As i am a Sr. Microsoft Exchange Systems Engineer.
From the exchange side..
There are a few things that were mentioned here..
Multiple devices and a limitation are caused by the setting called ThrottlingPolicy and can be any number. Although the default is 10 in Microsoft exchange.
The logging into the system with SSL vs TLS vs Basic and ports are all controlled by the Client Hub transport services on the exchange server. This is 100% dependent on your environment. It really doesn't make much of a difference what it is, as long as you have your client side device configured correctly to connect to it. There are additional variables here though, which can do with certificates, etc.. so you want to check with your exchange admins and they should be able to tell you what the settings are on the exchange server so that you can connect.
In addition to this, there are also documentation links for Microsoft TechNet and Microsoft MSDN that indicate that there are known issues with active sync and the iphone devices, but while active sync is an open code, the apple side is not, so you may need to reach out to apple on this.
I have a current BUG case open with Apple, after indicating that this will really play into whether we scrap use of apple and go with Android on our next purchase. That being said i should get an update as to what is the ultimate fix, and provide details on this case once i do.. At minimal maybe that will help you all out..
If anyone has any Exchange questions, or Has any questions about IOS with Exchange, i can see if we can just get to the bottom of this..