1. Incorrect account password: Please confirm that the entered account name and password are correct, and pay attention to case sensitivity. If you forget your password, you can try to get it back or contact your system administrator to reset it.

2. Network connection problem: Please make sure the network connection is normal, try to reconnect to the network or try to log in using other network environment.

3. System failure: If multiple attempts to log in still fail, it may be an internal failure of the system. It is recommended to contact the system administrator for handling.

4. Permission: The system may have set different user permissions. If your account does not have sufficient permissions to log in, it may lead to login failure. Please contact the system administrator to confirm that your account permissions are set correctly.