WiFi disconnects on Apple devices seconds after the connection
03/26/2020 51 13268
The WiFi on Apple devices drops seconds after the connection: It only happens when a captive portal or web authentication is being used on the SonicWall to allow internet traffic.
This issue is due to the Apple Captive Portal: everytime you connect to the WiFi, iOS will check the connectivity by querying via HTTP "captive.apple.com". If you have a rule blocking the Internet traffic until the successful authentication, this traffic won't get a response, so the WiFi will be disconnected.
This issue can be resolved by:
disabling the Captive Portal on the Apple devices.
creating an Access Rule on the SonicWall to allow with no authentication all the traffic to captive.apple.com
If you decide to create the access rule, please follow the steps below:
Create a FQDN Address Object for "captive.apple.com" from Network | Address Objects
Create an Access rule to allow all the traffic to the Address Object above:
The situation will now be as below:
The first ACL will allow DNS traffic
The second ACL will allow traffic to captive.apple.com
The third ACL will trigger the authentication page