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Deco X55 (1.0) - DoT issues

Deco X55 (1.0) - DoT issues

Deco X55 (1.0) - DoT issues
Deco X55 (1.0) - DoT issues
2025-07-10 04:07:13 - last edited 2025-08-06 08:19:38
Tags: #DoT
Model: Deco X55  
Hardware Version: V1
Firmware Version: 1.6.7 Build 25031412 Rel. 48241

After updating my Deco X55 (v1) to the latest firmware version 1.6.7, I’ve been experiencing multiple daily Internet disconnections when using DoT mode.
 

In my setup, I have three DoT servers configured: AdGuard, Cloudflare, and Quad9. Everything worked fine with the previous firmware version. However, since the update, I’ve had to manually refresh the DNS servers several times a day, as my devices were losing Internet access.
 

The only workaround I’ve found so far is switching to DoH mode. Since then, I haven’t had any issues — it’s been running smoothly for several days.
 

I'm not an expert in these matters and honestly don’t have a strong preference between DoT and DoH, but I had read that DoT is generally better suited for routers.
 

If anyone else has experienced the same issue and would like to share their thoughts, you're more than welcome! 😊

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#1
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1 Accepted Solution
Re:Deco X55 (1.0) - DoT issues-Solution
2025-07-11 07:56:41 - last edited 2025-08-06 08:19:38

Hi  @David-TP, thanks for getting back to me. Right now, I have it configured with DoH and it’s been working fine for several days, so I don’t think the current logs would be of much help. What I meant was that with the latest version, when DoT was enabled, some devices would randomly lose internet connection. Restarting the Deco didn’t solve the issue, but refreshing the DoT server settings on the router did. It seemed like the connection to the DNS servers was being cut off and the DNS couldn’t be assigned to all devices properly.

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#5
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Re:Deco X55 (1.0) - DoT issues
2025-07-10 12:23:51

  @Whitesnake 

I am using my Deco X55 (1.0) mesh network in AP mode but I have serious issues after upgrading to 1.6.7.

 

WiFi is extremely slow and unstable

If I connect a PC to an Ethernet port on a remote Deco I get full speed but if I connect my PC to the same Deco via WiFi I get 90% reduced speed and very unstable

Web page loading indicates DNS lookup errors

 

This did not happen in previous firmware 1.5.5

 

Has anyone experienced similar issues?

 

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#2
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Re:Deco X55 (1.0) - DoT issues
2025-07-11 07:29:22

  @Whitesnake 

Hi, nice to see you again.

Can you consistently reproduce the following issue?

After configuring a DOT server, the devices start losing internet access.

-Could you please refer to this link to help me submit the system log:

Deco web interface login

(you could send the log to support.forum@tp-link.com, and please add the forum ID#831180)

 

"devices were losing Internet access", is it like the mobile devices randomly can't open certain websites？

Wait for your reply.

Best regards.

 

▶Check What's Currently Going on With Deco ▶Deco BE85 1.2.0 Enhanced Mesh Backhaul Stability and Device Roaming Experience ▶Deco BE65/BE65 Pro 1.2.0 Enhanced Mesh Network Stability and System Security ▶Deco BE75 1.1.0 Added WireGuard VPN, Manual Channel Selection and More Try to leave a Message if urgent help is required.
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#3
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Re:Deco X55 (1.0) - DoT issues
2025-07-11 07:37:34

  @GaryDewing 

Hi, welcome to the community.

Can I have some screenshots of the network map, such as:

Would there be many smart home devices on the Mesh network?

Did you manually restart the whole Mesh once to see whether it made any difference?

Wait for your reply.

Best regards.

▶Check What's Currently Going on With Deco ▶Deco BE85 1.2.0 Enhanced Mesh Backhaul Stability and Device Roaming Experience ▶Deco BE65/BE65 Pro 1.2.0 Enhanced Mesh Network Stability and System Security ▶Deco BE75 1.1.0 Added WireGuard VPN, Manual Channel Selection and More Try to leave a Message if urgent help is required.
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#4
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Re:Deco X55 (1.0) - DoT issues-Solution
2025-07-11 07:56:41 - last edited 2025-08-06 08:19:38

Hi  @David-TP, thanks for getting back to me. Right now, I have it configured with DoH and it’s been working fine for several days, so I don’t think the current logs would be of much help. What I meant was that with the latest version, when DoT was enabled, some devices would randomly lose internet connection. Restarting the Deco didn’t solve the issue, but refreshing the DoT server settings on the router did. It seemed like the connection to the DNS servers was being cut off and the DNS couldn’t be assigned to all devices properly.

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#5
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