Ran into the same exact issue and after setting up FTP Firewall Support in IIS to match my external IP, still had the issue. As a last step, I went to edit the actual FTP rule in the Windows Firewall and allowed Edge traversal -> Allow Edge Traversal under the Advanced tab hit Apply/OK and restarted the FTPSVC in the Services. After that I no longer had any issues.
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Answer by vandsh for How to resolve FTP Error “Failed to retrieve directory listing” for Administrator account in IIS 7.5
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