Common IKEv2/IPsec Errors on Android and How to Fix Them

- Wrong username/password or invalid certificate.

- Double-check your username and password.

- If using a certificate, ensure it is installed correctly and still valid.

- If you are stuck, contact ChitaVPN support.

- The VPN server may be offline.

- Ports (UDP 500/4500) might be blocked, or the network is unstable.

- Make sure the server is reachable.

- Check that UDP 500 and 4500 are open.

- If it continues, contact ChitaVPN support.

- Android cannot complete IKE negotiation.

- Possibly a certificate mismatch or server unreachable.

- Verify the certificate or PSK (if used).

- Check the server status and firewall rules.

- For more help, contact ChitaVPN support.

- The VPN server’s certificate cannot be validated.

- Missing or untrusted root CA on your device.

- Install the required root certificate or trust the self-signed certificate.

- If unresolved, contact ChitaVPN support.

- Encryption settings or DH groups do not match on the server/client.

- Align encryption settings (AES, SHA, DH group) on Android and the VPN server.

- If you cannot fix it, contact ChitaVPN support.

- A generic Android network error.

- Possibly local Wi-Fi or mobile data blocking IKEv2 ports.

- Check that your network allows UDP 500 and 4500.

- If it persists, contact ChitaVPN support.

- The shared secret (PSK) is incorrect or mismatched.

- Ensure the PSK is exactly the same on both client and server.

- If you are still stuck, contact ChitaVPN support.

- The server address or ports are not set up correctly.

- The VPN server might be down.

- Verify the server is running.

- Check the server address and confirm UDP 500/4500 are open.

- If the error continues, contact ChitaVPN support.