Do you have public IP address on WAN and Internet Access enable in USB Settings->FTP Server Configuration?

Your public IP is 86.121.105.103

I suggest you install Gargoyle on TP-Link. You'll be glad.

The reason i write this post that i would like to ask how can i set-up an ftp server on my wr1043n . http://www.tp-link.com.pl/Resources/document/TL-WDR4300_FTP_Server_Applicat.pdf If so where can i...

Thanks for information.

Have you tried change wireless channel? I think of course about main router settings