1. Network connection problem: First, please make sure your network connection is normal. You can try to reconnect to the network or try to query in other network environments.
2. System maintenance or failure: It is possible that the Shanghai personnel file inquiry system is being maintained or has encountered a failure. You can try again later, or contact the relevant departments to find out.
3. Browser compatibility issues: If you are using a browser, compatibility issues may arise in some cases. You can try to use other browsers to query or update your browser version.
4. Equipment problems: In some cases, individual equipment may not be able to access some websites or systems normally. You can try to use other devices to query, such as mobile phones, tablets and so on.
If you have tried the above methods and still can't solve the problem, I suggest you contact the technical support of Shanghai Personnel Archives Service Center or relevant departments, and they will provide you with more professional help and solutions.