After you have configured the FTP server in Windows Server R2, you can access it natively, but not from another computer. The reason is that the firewall is not configured properly.
1. First check the inbound rules in Server Manager to ensure that the FTP server is enabled. Such as:
The above general default is configured, the key is the following configuration, need to be done manually.
2. Open "Control Panel"-"Windows Firewall", click "Allow programs or features through Windows Firewall" on the left, click "Allow another program to run" in the new window. In the browse, find "C:\Windows\System32\svchost.exe", open and Add. This time there will be a more "Windows service Master process", check the following two check boxes, such as. Confirm after completion.
You can now access the server's FTP service from outside.
Workaround for Windows Server R2 FTP cannot be accessed externally