After the IIS server is configured, machines in the LAN cannot access FTP

Recently, due to work reasons, we need to FTP the generated file to another server, so we began to install IIS, and then configure the file. After the final steps are completed, a problem occurs: the server configured with IIS can successfully FTP itself, but other machines in the LAN cannot FTP. I checked a lot of information on the Internet to solve the problem as follows:

Other machines can access the same CIDR block but cannot access it,
First, if the machine on which your IIS is located has a firewall (including those of WINXP and third parties), you should check whether port 80 is enabled in the firewall; you can disable all firewalls to test whether this is the case.
If this is not the case, go to IIS -- your site -- property to check whether the local IP address is selected. If so, change it to "(all unallocated )";
After the above two cases, the problem should be solved.

However, your IIS configuration is correct before, including (in the service, IIS Admin/Remote Procedure Call (RPC) Security Accounts manager must be enabled.