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Troubleshooting Abnormal WAN Port Speed. Please Check Your WAN Port Connection

Troubleshooting Abnormal WAN Port Speed. Please Check Your WAN Port Connection

TroubleshootingAbnormal WAN Port Speed. Please Check Your WAN Port Connection
Abnormal WAN Port Speed. Please Check Your WAN Port Connection
2023-09-05 07:30:48 - last edited 2023-09-05 07:35:00
Tags: #Official
Model: Deco  
Hardware Version:
Firmware Version:

Since the release of 1.6.0/1.1.0 firmware versions, A new feature has been added that users will get a notification on the Deco APP when the Internet negotiation speed between Deco and modem is lower than expected. For example, for gigabit models, like Deco M5/M9 Plus, you could get an error message when the internet negotiation speed is lower than 100m/s. While on Multi-gigabit models, like Deco X90 and Deco X50-POE with 2.5G Ports, the detection mechanism would be a little different.
 
 

Here are some cases we have received recently:
 

Case One: For Gigabit models, like Deco M5/M9 Plus.
 

Since this new Ethernet link speed detection feature was added since 1.6.0, some users might think it was brought by the firmware upgrade but actually it wasn't related to any firmware upgrade.
 

So if you happened to get a notification on the Deco APP, the following suggestions would help:

  • Remove Deco from the modem and connect a laptop via the same cable to the ISP modem to make sure the laptop can still stably get more than 100m/s.
  • Restart the main Deco once.

If the speed could be restored every time after a fresh restart and dropped down again a few hours later, please replace a new Ethernet cable and change a different Deco as the main Deco.>>How to Set up the Satellite Deco or a new Deco to be the Main Deco

  •  If Restart did not make any difference, please hold the reset pinhole for 1s and set it again from scratches.


Case Two: For Multi-gigabit models, like Deco X90/X5700/X50-POE etc.
 

For Deco with 2.5G ports, when the ISP modem is connected to its 2.5G port, the expected negotiation speed is supposed to be 2.5G. So when the internet bandwidth is only 1G/s, the 2.5G port on Deco could only get 1G speed negotiation which is less than what it is capable of. You could get a notification of Abnormal WNA speed but It actually does not affect the final internet bandwidth since the total internet bandwidth is only 1G. 

It could be temporarily resolved by connecting the ISP modem to the 1G port of the main Deco.
This issue has been located and will be improved along with the firmware update of Deco.


However, for Multi-gigabit models, if the actual speed was affected and lowered than 1G when the APP reported Abnormal speed, please also refer to the suggestions in Case One as well.

 

Related Articles:

Deco LAN speed is capped at 100m/s

Slow Internet Speed with Deco Devices

 

▶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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#1
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4 Reply
Re:Abnormal WAN Port Speed. Please Check Your WAN Port Connection
2023-12-02 05:24:19

  @David-TP 

 

so you're saying that we need to reset our main router, then rebuild our mesh network and then re-add the 68 devices on the network every time this happens??

 

im pulling 3mb up 3mb down on gigabit speed isp (checked at the modem and have replaced patch cable just in case) with my x90 (2x) and m5 (2x) combined network with one x90 as "main".

 

this massive drop in speed did very much so happen after firmware upgrade. I have been hoping for VPN access for years and now that we have it I am looking at changing systems.

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Re:Abnormal WAN Port Speed. Please Check Your WAN Port Connection
2025-07-03 18:50:34

  @David-TP 

 

omg

 

so your solution is to reset the router and decos everytime this issue appear ??

 

are you kidding ??

 

the issue comes again and again even if we reset our router and our decos... the issue comes again after hours or few days

 

not just that... the speed dropped from 200 to 80 or 90

 

i had deco m4 before which is very old deco... and i never had this issue at all

 

now i have deco x50 outdoor and every few days and sometimes hours not days... the issue appear

 

i did everything and no hope

 

i change the ethernet cable from 5e to 6 to 7 and same problem

 

i did reset to deco and start the setup from 0 and still same issue

 

i keep doing restart to my router and decos everytime this issue appear because when this issue appear my speed dropped

 

i never had this issue before the last firmware update so its because the update not because our routers or modems... not because the decos... its because the update

 

fix this problem before you lose many users

 

i thought its because my router so i connect my phone direct to my router and the speed is 190 to 200... but when i connect to this deco the speed is 90 or 80

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Re:Abnormal WAN Port Speed. Please Check Your WAN Port Connection
3 weeks ago
meme probleme et la seule soulution que j'ai trouvée c'est de debranché et rebranché mon RJ 45 et ca repart mais pas lgts helas.
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Re:Abnormal WAN Port Speed. Please Check Your WAN Port Connection
3 weeks ago

  @Ptilo19 

Hi, can I have the model number and firmware version of your Deco?

When the WAN error pops up, would the actual WAN speed actually get affected?

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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