What's the model number of network card on your PC? Can you try different Ethernet cables or PCs? If it is confirmed as the WR841N issue, get a replacement under warranty.

Try again via a different web browser.

If the problem occurs after you upgrade the firmware, did you try to upload the previous firmware? Did you report the problem to TP-LINK support team?...

boward57 wrote I have the same issue and nobody will answer! If so, why not contact their support team directly if you need an "answer"? Here is the forum for users to communicate and share......

Did you try this guide? http://www.tp-link.com/en/faq-715.html

Submit a ticket here to report the problem and describe it in details. http://ticket.tp-link.com/index.php?/Tickets/Submit