Sometimes on iOS, the VPN fails to connect due to the device’s network problem. In such cases, it helps to reset the network settings of the device. Here’s how to do that:
Note: This will delete all your saved WiFi passwords on your device, so make sure you write them down before performing this
Step 1: Open the Settings and go to General.
Step 2: Scroll down to Reset.
Step 3: Click on Reset Network Settings.
Step 4: Enter your device Password (If you have one, it’s the same code you use to unlock your device.
Step 5: Confirm by clicking on Reset Network Settings
If you are using a WiFi Network, you will need to connect to that network again, then try to connect to VPN after that.