I am facing a baffling problem. For the past month I have used an FTP server, running Ubuntu Server 14.04 and it has worked flawlessly. During that time I was using an old Apple router from the early 2000's, so an upgrade was needed. I upgraded to the new, fast Linksys WRT1900ac. It has the speed that I desire, but I have run into a hiccup. I cannot access the FTP server remotely anymore. When I have my computer connected to the network and I use the local IP address of the server, it works flawlessly. Unfortunately when I try to connect to the server remotely from the router's WAN IP, I get connection time out errors.
The server has a static IP address and has not had the ability to connect to the internet. All the router IPs and gateway IPs are set properly and the computer is still unable to connect. That could be an issue. Another question is, could it be the router causing the issue? I can access the router remotely by ping and Linksys's Smart WIFI, but telnet fails. Could it also be the router unable to forward the ports? I have opened port 21 for FTP and have tried opening port 20 as well.
Any help would be appreciated. Thank you in advance.