The fifth step is to note that there is no missing address in the list, and no major address has been added. This principle can be said to be a summary of the above four principles. Simply put, it is the integrity and accuracy of the relevant IP address. One less, one more, not more.
Normally, as long as none of the above rules is configured in the NAT configuration, the configuration of the NAT itself will be fine. At this point, if the user still cannot access the internal application server, other reasons need to be considered. Such as routing problems and so on.