Final answer:
To manually create a port rule for an NLB cluster, access the cluster properties, navigate to port rules, and configure the desired settings for traffic filtering, load balancing method, and host priority.
Step-by-step explanation:
To manually create a port rule for a Network Load Balancing (NLB) cluster, you need to access the properties of the NLB cluster and navigate to the port rules section. From there, you can define a new port rule by specifying the particular port or range of ports you wish to configure, the protocol, and the IP address for filtering network traffic. You also have to decide on the load balancing method (such as multiple hosts, single host, or disabled), define host priorities, and set other parameters like the handling of client affinity. After configuring these details, you apply the settings, and the NLB cluster will start distributing traffic according to the newly created rule.