@TP-Link_Deco 

 

Thanks for the reply.

 

Done that, but still the same.

 

As soon as it reached the step to try connecting to the internet, the LED turned solid red.

@TP-Link_Deco 

 

Hi.

 

I got valid IP when connected to the modem directly, and able to access the Internet. Main Deco got a valid IP as well.

 

I have not tried to connect the other Deco as main.

 

Will try it early tomorrow morning, since I need the stable Internet connection for work.

 

Will update again on the result.

 

Thanks again!

@TP-Link_Deco 

 

Just tested again using the other Deco as main - same issue. It was solid Blue during the initial setup but turned solid red when it is at the step of 'Creating your Wi-Fi network'. Although it says successfully created but failed to connect to the Internet. LED remained solid red. Connected back my wifi router to the modem, able to access the Internet.

 

I've also followed the instructions here - https://www.tp-link.com/my/support/faq/2239/

 

1. Tap “Skip This Step” on the bottom of the error page, on the Deco app, click on More->Advanced->IPv4, check the WAN IP address of the Deco and change the DNS server to 8.8.8.8 for a try. Here is the instruction.

2. Connect a computer to the modem directly, check whether the computer has internet access, if there is no internet access on the computer, it’s suggested to contact ISP.

If the computer has internet access, use the same Ethernet cable and the same port on the modem connect to the main Deco, then check whether the Deco will work or not.

3. If you have an old router, connect your network devices as modem-old router-main Deco, then setup the main Deco. After the main Deco is configured successfully, connect the main Deco to the modem directly and enjoy the internet with Deco.

 

Step #2 didn't work - Deco is not connecting to the Internet.

Step #3 worked - Deco only works if I connect it to my wifi router (Modem > Wifi Router > Deco)

Update - 20 Nov 2020

 

After exhausting all possible support channels (TP-Link Customer Service/Technical Support/TM Support) and with no workable solutions - I finally fixed it by enabling IPTV/VLAN settings in Deco app, and a little patience for the solid red LED to turn solid white.

 

A summary of my problem:

1. Got my pair of Deco sometimes in June 2020 and my setup is Unifi Huawei Modem > Deco. It was working perfectly fine until one day in July/August, where it suddenly stopped working. LED is solid red.
2. No settings changed in my network setup or Unifi. Deco was untouched since they are first installed.
3. Tried resetting both Deco, took turn to set each as the main Deco. The setup went well, it was able to create the new wireless network and connected to it. The LED turn solid red at "Test Internet Connection" step.
4. Followed the steps outlined here - https://www.tp-link.com/hk/support/faq/2239/ - and still didn't work.
5. Up to this point, I took my Asus Wireless Router out and connected it to the Unifi modem - Internet is back!
6. Tried setting up the main Deco by connecting to the wireless router - Deco is working! So, it only work in AP mode by not Router mode. The working network setup is Unifi Huawei Modem > Asus Wireless Router > Deco. This is not the reason I get the Deco. I hope to get ride of the wireless router.
7. After few months of researching for solutions, I found a post that suggest to enable IPTV/VLAN settings in Deco app.
8. So, I rearranged my network setup back to Router mode (Unifi Huawei Modem > Deco). The LED did turned solid red at "Test Internet Connection" step. I selected "Skip this step", returned to the Advanced setting in Deco app, and enabled IPTV/VLAN option.
9. It took some time for the LED to turn from solid red to solid white. I think around 3-4 minutes. So, must wait patiently.

 

Now, I can stash away my wireless router and I hope there won't be any problem again in the future.

@phy_lis I had the same problem after rebooting. When I changed the ethernet cable port it turned instantly green for me.

 

Maybe a dhcp problem between both routers. 

I tried that too but didn't work. At last it worked after I enabled the IPTV/VLAN setting in Deco app.