1. The computer is not connected to the network where the management center is located: the management center is the core of the information security system and is responsible for monitoring and managing the network. If the computer is not connected to the network where the management center is located, it can't communicate with the management center, and naturally it can't install the EDR client.

2. The versions of the client and the management center are incompatible: if the versions of the client and the management center are incompatible, the connection cannot be established. Therefore, before installing the EDR client, it is necessary to confirm whether the versions of the client and the management center are compatible.

3. Limitation of firewall or security policy: The connection problem may be caused by the limitation of firewall or security policy. In this case, you need to check the firewall or security policy settings to ensure that the EDR client can connect to the management center normally.

Aiming at the problem that the management center is not connected to the network, the following methods can be adopted to solve it:

1. Confirm whether the computer is connected to the network where the Management Center is located. If not, you need to connect to the network first, and then try to connect to the management center.

2. Confirm whether the versions of the client and the management center are compatible. If not, you need to upgrade the client or Manager to ensure compatibility.

3. Check the firewall or security policy settings to allow EDR clients to connect to the management center.

If the above methods can't solve the problem, you can contact the technical support of the manufacturer for further investigation and solution.