I am trying to setup a Filezilla FTP server on one of my PCs. I also have two other PCs all running Windows 8.1. (I have not used the third PC at all) I did try to use the Windows FTP server, but got bogged down, so I formatted the PC with the Windows FTP software and reinstalled 8.1 in case I had messed it all up. I am getting confused about some aspects, and the possible need for a router that does NAT Feedback, my router does not support NAT feedback. I also cannot get a fixed IP address from my ISP TalkTalk. I have created a free account with NO-IP, but the host name cannot be chosen on the free account. The name is something like sparrow34.ddns.net (not the real one, but similar format). I can login to the server from the other PC sharing the router by using 22.214.171.124, but cannot use the NO-IP name, which I believe is for external use from another system. The thing that puzzles me most, is I cannot pass any of the Online FTP server checkers. Various error messages, but one was saying something was private, but should be public. I am using WinSCP as my client, and it seems good software. I have redirected the IP4 address of the server PC to ports 20 to 21 to 192.168.1.151 (think I only need 21). I have made the IP4 address of the server to be fixed using Windows Network settings to 192.168.1.151 which is redirected on the router. So I can connect using the NO-IP user name I have added I have added 192.168 1.151 to the hosts file. Using the other PC on the same router, If I try to connect using WINSCP as client with 192.168.1.151 as the address I go straight the shared folder, but I can see all of the folders and drives on the server, and I only shared 1 folder in FileZilla FTPSERVER. I CANNOT ping 192.168.1.2 which is the other PCs own IP4 address. I cannot connect using sparrow34.ddns.net. Sorry to ask so many questions, but I know that there are some fantastic people on this forum. I really want to know if I am wasting my time or doing something wrong wit NO-IP. On the other PC I can Ping the external IP sparow34.ddns.net, but not ping 192.168.1.151. This is puzzling me. On the PC used as server I CAN ping 192.168.1.151 and also CAN also ping sparrow34.ddns.net I do not use any extra anti virus of firewall, other than Windows Defender. There is hardly any other sofware on the Server. If anyone could point me in the right direction I would be most grateful. I have used PCs for over 30 years since the Sirius, but as I get older I feel that I am not so sharp as I was.