How to Fix Cannot Verify Server Identity on iPhone/iPad

1. Restart Your Device​

1. On iPhone X/11/12 or iPad without a Home button:
   • Press and hold the volume down button and the side button/Top button (on iPad) until the power-off slider appears.
   • Drag the slider to turn off your device.
   • After the device turns off, press and hold the side button until the Apple logo appears
     
     
     
2. On iPhone 8 or earlier/iPad with Home button:
   • Press and hold the side/top button until the power-off slider appears.
   • Drag the slider to turn off your device.
   • After the device turns off, press and hold the side/top button until the Apple logo appears.

Restarting your device can often fix minor software glitches that might be causing the error.

2. Quit and Restart the Mail App​

1. On your iPhone/iPad, double press the Home button or swipe up from the bottom (depending on your device model) to open the app switcher.
2. Find the Mail app and swipe it up to close it.
3. Reopen the Mail app from your home screen.

Restarting the Mail app can resolve unexpected in-app errors that could be causing the verification issue.

3. Reset Network Settings​

1. Open the Settings app on your iPhone/iPad.
2. Go to General.
3. Scroll down and tap Transfer or Reset iPhone.
4. Tap Reset.
5. Select Reset Network Settings and confirm by entering your passcode if prompted.

Resetting network settings can resolve network-related issues that might be causing the server identity error.

4. Delete and Re-add Your Mail Account​

1. Go to Settings on your iPhone/iPad.
2. Tap Mail.
3. Tap Accounts.
4. Select the email account giving you trouble.
5. Tap Delete Account and confirm.
6. Go back to Accounts and tap Add Account.
7. Follow the on-screen instructions to re-add your email account.

Re-adding your email account can fix issues related to server certificates by refreshing your email settings.

5. Reset All Settings​

1. Open Settings on your device.
2. Go to General.
3. Tap Transfer or Reset iPhone.
4. Select Reset.
5. Tap Reset All Settings and enter your passcode to confirm.

Resetting all settings will restore your device to default settings without erasing your data, which can fix persistent software glitches.

6. Disable SSL​

1. Open Settings and go to Mail.
2. Tap Accounts and select the problematic email account.
3. Tap Account and then Advanced.
4. Toggle off the Use SSL option.

Disabling SSL can sometimes bypass verification issues, although it’s less secure. Proceed with caution.

7. Unsubscribe From Calendar Events​

1. Open Settings on your iPhone.
2. Go to Calendar.
3. Tap Accounts.
4. Select the calendar subscription causing issues.
5. Toggle off Use SSL or tap Delete Account if the issue persists.

Calendar subscriptions with expired SSL certificates can cause verification errors. Unsubscribing can eliminate these errors.

8. Adjust Date and Time Settings​

1. Open Settings on your iPhone.
2. Go to General.
3. Tap Date & Time.
4. Toggle on Set Automatically.

Incorrect date and time settings can cause verification errors. Setting these automatically ensures accuracy.

9. Clear Safari Website Data​

1. Open Settings on your iPhone.
2. Scroll down and tap Safari.
3. Tap Clear History and Website Data.
4. Confirm by tapping Clear History.

Clearing website data can resolve issues caused by corrupted data in Safari.

10. Update iOS Version​

1. Open Settings on your iPhone/iPad.
2. Tap General.
3. Tap Software Update.
4. If an update is available, tap Download and Install.

Updating to the latest iOS version can fix bugs and improve system performance, potentially resolving the server identity issue.

11. Update Carrier Settings​

1. Open Settings on your iPhone.
2. Tap General.
3. Tap About.
4. Follow the on-screen instructions to update carrier settings if available.

Outdated carrier settings can affect email syncing, so keeping them updated can help resolve verification issues.

12. Factory Reset iOS Device​

1. Open Settings on your iPhone.
2. Tap General.
3. Scroll down and tap Transfer or Reset iPhone.
4. Tap Erase All Content and Settings.
5. Enter your passcode to confirm and follow the on-screen instructions.

A factory reset will erase all your data, so make sure to back up your device beforehand. This method should be a last resort if other solutions fail.

These steps should help you resolve the "Cannot Verify Server Identity" error on your iPhone/iPad.