We have the same problem with managed or unmanaged iOS devices.  The MR Layer7 firewall rule for denying 'online backup', iCloud is part of that. Access to iCloud is what is breaking text messages (iMessage) that contains pictures or a video.     ... View more

We are on 28.5 and have the issues.  Currently pending firmware upgrade to 28.7 or 29.5.1 depending on downtime windows which are a huge problem in our environment.     It's really bugging me the number of peoples sites that seem to have this problem and no real response from Meraki.  Also given that this issue seems to have been going on for quite a while, I would have expected it to be at least acknowledged by TAC. And that the minute I engage TAC since 28.5 is marked as 'critical' I get the canned "Upgrade the firmware" response is pretty annoying, as I point out the release notes do not contain any mention of this issue or an issue similar.  ... View more

I'd love to know how you rollback goes. How larger of a global deployment do you have? Rough number of networks and APs? Unfortunately, we dont have the option to roll back other than one or maybe two very small test sites. One of those would only have 1 client at best the other maybe 4-5 clients but only 1 access point.  Any of you that have worked with Meraki TAC do you feel like they are addressing the issue? Have you escalated to any Meraki SE contact?  ... View more

Did they suggest what firmware to downgrade to?  We seem to be encountering the same issues but have been on MR28.5 for quite a long time. Lots high density locations as well.. ... View more