Why does an S series switch as a server fail to negotiate a Listening port with another device

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For S series switches (except the S1700), the reason why a server fails to negotiate a Listening port with another device is as follows:
The prerequisite for a server to negotiate a Listening port with another device is that the server receives a Hello message from the peer and finds that it is the destination server based on the transport address carried in the Hello message. Therefore, if the server does not negotiate a Listening port with another device, check whether the Hello message is received and check the transport address in the received Hello message.

Other related questions:
Why does not a server establish a Listening port
The prerequisite for a server to establish a Listening port is: The server receives a Hello message from the peer end and finds itself the destination server based on the transport address carried in the Hello message. If the server does not establish a Listening port, check the Hello message receiving and transport address in the received Hello message.

Why does traffic forwarding fail when an S series switch is connected to another device through Eth-Trunk
After Eth-Trunk link aggregation is configured for an S series switch (except the S1700), the Eth-Trunk works in manual load balancing mode by default. If Eth-Trunk link aggregation is also configured for the peer device, the Eth-Trunk works in LACP mode by default. The two ends of the Eth-Trunk work in different default modes, resulting in forward traffic failure. To ensure normal traffic forwarding, you must configure the same working mode for the two ends.

Why does traffic forwarding fail when the switch is connected to another device through an Eth-Trunk
After an Eth-Trunk is configured on the switch, the manual load balancing mode is adopted on the Eth-Trunk by default. If the device connected to the switch uses the static LACP mode after link aggregation is configured, the two devices use different working modes at two ends of the Eth-Trunk. As a result, traffic cannot be transmitted on the Eth-Trunk. To ensure traffic transmission on the Eth-Trunk, you need to set the same working mode on the two devices.

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