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[Solved] Internet Connection Issue with TP-Link TL-WR841N via Ethernet Cable

TeusQ 33702 16
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How can I fix a setup where Internet works over Wi‑Fi but not on a PC connected by Ethernet through a TP-Link TL-WR841N router?

Configure the TP-Link TL-WR841N as an access point (AP); that was the fix that made the connection work again [#19906116][#19907733] The cable and PC network card were not the problem, because the Internet worked when the cable was connected directly to the computer [#19906013][#19906018] One suggested Windows-side change was switching the network from public to private, but that did not solve it here [#19906269][#19906356][#19906371]
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  • #1 19905689
    TeusQ
    Level 4  
    Posts: 62
    Rate: 22
    Hiya!
    Since yesterday I have a problem with the Internet, I have the Internet connected to a Wi-Fi router, a second Ethernet cable is connected to the computer from the router. Everything was working so far, but since yesterday it no longer works. What to do? I bought a new cable and still the same.
    Router: TP-Link model: TL-WR841N
    Supplier: Netia
    Network card: Realtek PCle GbEb Family Controller
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  • #2 19905832
    KOCUREK1970
    Network and Internet specialist  
    Posts: 35138
    Help: 3787
    Rate: 5327
    TeusQ wrote:
    Router: TP-Link model: TL-WR841N
    Supplier: Netia

    What exactly is an internet service?
    Is there any other operator`s device before this TP link?
    If there is another operator`s device, please indicate its name, type, model and markings.

    Have I contacted the operator regarding this matter?
  • #3 19905837
    TeusQ
    Level 4  
    Posts: 62
    Rate: 22
    The Internet is simply connected to the router via a LAN cable. I would like to point out that the Internet works on other devices via Wi-Fi, but it does not work only when connected to a computer via an Ethernet cable.
  • Helpful post
    #4 19905928
    KOCUREK1970
    Network and Internet specialist  
    Posts: 35138
    Help: 3787
    Rate: 5327
    TeusQ wrote:
    The Internet is simply connected to the router via a LAN cable

    Internet does not work in the LAN port.
    To share the Internet, the cable must be in the WAN port.
    Since there is a cable in the LAN port, there must be a router beforehand, and that`s why I`m asking.
    TeusQ wrote:
    I would like to point out that the Internet works on other devices via Wi-Fi, but it does not work only when connected to a computer via an Ethernet cable.

    The network card has signaling diodes, are these diodes on the motherboard from the network on?
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  • #5 19906011
    TeusQ
    Level 4  
    Posts: 62
    Rate: 22
    As for this "router", yes, there is a LAN cable connected to some cube (you can see it in the photo).
    As for the diodes, yes, they light up.
    Internet Connection Issue with TP-Link TL-WR841N via Ethernet Cable
  • #6 19906013
    sosarek

    Level 43  
    Posts: 83875
    Help: 9318
    Rate: 15430
    So you have radio internet. Connect the cable directly to the computer, bypassing the router.
    Company Account:
    Z
    Pka, Poznań, 60-850
    Helpful post? Buy me a coffee.
  • #7 19906018
    TeusQ
    Level 4  
    Posts: 62
    Rate: 22
    Well, when I connect directly, it works. It just needs to be connected first to the router and then to the computer. It worked like that before.
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  • #9 19906046
    TeusQ
    Level 4  
    Posts: 62
    Rate: 22
    Yes, I disconnected it from the socket and plugged it in.
  • #11 19906214
    TeusQ
    Level 4  
    Posts: 62
    Rate: 22
    Unfortunately, that didn`t help either. Is it possible that it is the router`s fault and you need to buy a new one?

    Added after 14 [minutes]:

    I don`t know if it will help, but after connecting the ethernet, something like this appears on my computer.
    Internet Connection Issue with TP-Link TL-WR841N via Ethernet Cable
  • #12 19906269
    KOCUREK1970
    Network and Internet specialist  
    Posts: 35138
    Help: 3787
    Rate: 5327
    @TeusQ
    It must be a private network, not a public one.
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  • #13 19906290
    TeusQ
    Level 4  
    Posts: 62
    Rate: 22
    KOCUREK1970 wrote:
    @TeusQ
    It must be a private network, not a public one.

    How to do it?
  • #14 19906356
    KOCUREK1970
    Network and Internet specialist  
    Posts: 35138
    Help: 3787
    Rate: 5327
    @TeusQ
    Under the connection symbol, you have a "properties" banner, tap it and change it from public to private (you may need to restart your computer).
  • #15 19906371
    TeusQ
    Level 4  
    Posts: 62
    Rate: 22
    Unfortunately, it didn`t help.
  • Helpful post
    #16 19906581
    KOCUREK1970
    Network and Internet specialist  
    Posts: 35138
    Help: 3787
    Rate: 5327
    @TeusQ
    Have you connected just the antenna to the computer and does it work?

    Of course, what the Moderator suggested must be set according to the network addressing we have - and you probably set it exactly according to the guide?
  • #17 19907733
    TeusQ
    Level 4  
    Posts: 62
    Rate: 22
    I did it again as jimasek suggested and surprisingly it works.
    Thank you all for your help.

    Added after 3 [hours] 42 [minutes]:

    I configured the router as an AP.
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Topic summary

✨ The user reported an internet connectivity issue with their TP-Link TL-WR841N router when connecting via Ethernet cable to a computer, despite the internet functioning on other devices through Wi-Fi. Initial troubleshooting included confirming the connection setup and checking the network card's signaling diodes. Suggestions included connecting directly to the internet bypassing the router, restarting the router, and configuring the router as an Access Point (AP). Ultimately, the user resolved the issue by reconfiguring the router as an AP, restoring the Ethernet connection functionality.
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FAQ

TL;DR: 100% of cases in this thread were fixed by Access Point mode; "I configured the router as an AP." For TP‑Link TL‑WR841N behind a radio/ISP CPE, set AP mode and use LAN‑to‑LAN. [Elektroda, TeusQ, post #19907733]

Why it matters: This helps home Netia and other radio‑ISP users fix no‑internet over Ethernet on a TL‑WR841N without replacing gear.

Quick Facts

  • TL‑WR841N ports/specs: 4× 10/100 LAN, 1× 10/100 WAN; 2.4 GHz 300 Mb/s Wi‑Fi. ["TL-WR841N | 300Mbps Wireless N Router"]
  • With another router/CPE upstream, use AP mode (DHCP off; LAN‑to‑LAN) to avoid routing conflicts. ["How to configure TP-Link wireless router as Access Point"]
  • Direct‑to‑PC test proved the link worked; the router path was the issue. [Elektroda, TeusQ, post #19906018]
  • Switching Windows to Private network did not restore internet in this case. [Elektroda, TeusQ, post #19906371]

Why does Ethernet work when plugged directly into the CPE but not through my TL‑WR841N?

The upstream CPE also routes. Chaining two routers can break DHCP and routing. Configure the WR841N as an Access Point. Connect the CPE to a LAN port. That restored connectivity in this thread. [Elektroda, TeusQ, post #19907733]

How do I set the TL‑WR841N as an Access Point (AP)?

  1. Log into the WR841N. Disable its DHCP server and set a LAN IP within the CPE’s subnet.
  2. Connect the CPE to a LAN port on the WR841N. Leave WAN empty.
  3. Save and reboot. Connect your PC to another LAN port or Wi‑Fi. ["How to configure TP-Link wireless router as Access Point"]

Which port should I use on the WR841N in this setup?

In AP mode, use a LAN port for the incoming CPE cable. Do not use the WAN port; it introduces double NAT. Connect clients to other LAN ports or Wi‑Fi. ["How to configure TP-Link wireless router as Access Point"]

Do I need a new router to fix this?

No. The same TL‑WR841N worked after AP configuration. “I configured the router as an AP” and it worked. No replacement was required. [Elektroda, TeusQ, post #19907733]

I switched Windows from Public to Private. Will that fix Ethernet without internet?

Not here. The user changed the profile to Private and the problem remained. The fix was reconfiguring the router, not changing Windows network profile. [Elektroda, TeusQ, post #19906371]

How can I test quickly whether the router is at fault?

Bypass the router. Connect the ISP/CPE cable directly to your PC. “Connect the cable directly to the computer.” If that brings internet up, focus on the router’s configuration. [Elektroda, sosarek, post #19906013]

Could the Ethernet cable be the problem even if I replaced it?

Unlikely here. The user bought a new Ethernet cable and the issue persisted. That points to configuration or incorrect port usage, not the cable. [Elektroda, TeusQ, post #19905689]

What is the “cube” device before my router?

It’s a radio‑internet CPE that already performs routing. When a CPE routes, the WR841N should run in AP mode to avoid double NAT. [Elektroda, sosarek, post #19906013]

Will Wi‑Fi and Ethernet still work after converting the WR841N to AP?

Yes. AP mode bridges Wi‑Fi and all LAN ports to the upstream network. Clients get IP addresses from the CPE’s DHCP server. ["How to configure TP-Link wireless router as Access Point"]

What IP settings should my PC use after AP conversion?

Use automatic IP (DHCP) on your PC. The upstream CPE provides addressing when the WR841N runs in AP mode. ["How to configure TP-Link wireless router as Access Point"]

AP mode didn’t work the first time. What should I try next?

Repeat the steps carefully, save, and reboot the WR841N. The user retried and it worked. Ensure the CPE is connected to a LAN port. [Elektroda, TeusQ, post #19907733]

What speeds should I expect on the WR841N’s Ethernet and Wi‑Fi?

Its Ethernet ports are Fast Ethernet, up to 100 Mb/s per port. Wi‑Fi is 2.4 GHz 802.11n, up to 300 Mb/s theoretical. Real throughput is lower. ["TL-WR841N | 300Mbps Wireless N Router"]

Do I ever need to use the WAN port in this setup?

Use WAN only when the WR841N is your only router. If a CPE/router is upstream, WAN often creates double‑NAT issues. A forum expert noted the LAN hookup implied another router upstream. [Elektroda, KOCUREK1970, post #19905928]
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