Forum Discussion
Iphones cannot connect via ActiveSync since 2016 CU19 and KB5000871
Hi, have upgraded a client 2016 server to CU19 and installed patch for KB500087 and since then all iphones can no longer connect via activesync using the native mail client. Outlook client connects, ...
WillT237, i am having a similar issue. Some of my apple devices are intermittently not syncing. Have you found a resolution to your issue?
We've had a similar issue after each upgrade only affecting iPhones & iPads. IIS activesync logs were full of 413 Payload Too Large errors and this was our solution:
http://tips4sysadmins.blogspot.com/2012/12/iis-75-uploadreadaheadsize.html
http://tips4sysadmins.blogspot.com/2012/12/iis-75-uploadreadaheadsize.html