A Combo port is a logical interface. Physically, one Combo port corresponds to one electrical port and one optical port on the device panel. The electrical port and its corresponding optical port are opto-multiplexed; they cannot work simultaneously (when one interface is activated, the other is automatically disabled). Users can choose to use either the electrical port or the optical port according to their networking needs.

1. Have the customer confirm their internet connection. 2. Then check if the device can ping our cloud platform domain name. If it cannot ping the domain name but can ping the cloud platform address, it's a DNS issue.