If you're having trouble re-enrolling your Android phone on the secure wireless network after your certificate has expired, follow the troubleshooting steps below.
1. Open list of wireless networks (usually found in Settings > Wi-Fi). You can also swipe down from the top and long-press the Wi-Fi icon.
2. Tap the three dots at the top and select Advanced.
3. Tap Manage networks.
4. Tap Bengal and then tap the Forget button.
After performing these troubleshooting steps, try enrolling your Android phone on the secure wireless network.