At this moment iOS11 is yet to be officially supported by Kerio Connect. Customers might be facing some issues with it. Kerio Connect 9.3.0 should have the official support for iOS11.
Note: Currently, we do not have a release date for Kerio Connect 9.3.0.
The list of compatible devices is given below:
- Apple iPhone 3GS, 4, 4S, 5, 5C, 5S, 6, 6 Plus with iOS 6.0 to 10
- Apple iPod Touch with iOS 6.0 to 10
- Apple iPad/iPad2/New iPad/iPad4 with iOS 6 to 10
As an alternative, while the new Kerio version is released, you can set up the account manually. Setup the Mail as an IMAP account and then set up a CalDAV account for the Calendars and a CardDAV account for Contacts.
Please follow the below instructions: