Hello,
According to the information you provided, the NLB node can establish a TCP connection normally, but will receive an RST report when accessing the NLB VIP. It is recommended that you can check the NLB configuration to make sure they are configured correctly in multicast mode and that the network connections between NLB nodes are communicating properly. And the static ARP entries and multiple outgoing interfaces have been configured correctly.
In addition, you can check whether the firewall settings of the NLB node are correct.
If the above steps have been checked and confirmed to be correct, you can try to use a network packet capture tool to capture data packets and analyze their contents to determine the root cause of the problem.
Thanks,
Shujun