Model : TL WR 741N

Hardware Version : WR741N v1/v2 00000000

Firmware Version :3.12.4 Build 100910 Rel.57694n


ISP :

I'm accessing any site except one, which is mine.
It does not matter if I use the cable connection or via WI FI the connection ends by time out.
But if I connect my PC on the internet using any other router, the site opens normally.
I've already changed the DNS, shut down the firewall and everything else regarding security, I made several resets, turn defaults settings, turn to factory defaults, restored and installed a back-up, and finally I changed the firmware
But the problem continues, I can not access my site, receive emails, ping does not work, even when I use the IP number.
I reinforce that if I use another router on this same PC everything works OK proving that something is barring my site and that something is inside the router.
What can I do to resolve this issue?

Thanks in advance