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Deco mesh has some devices unable to access internet following firmware

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Deco mesh has some devices unable to access internet following firmware

Deco mesh has some devices unable to access internet following firmware
Deco mesh has some devices unable to access internet following firmware
3 weeks ago - last edited Yesterday
Model: Deco M5  
Hardware Version:
Firmware Version: 1.8.5

M5 mesh network, I Updated the firmware to 1.8.5 20250612 rel 44225.

 

Since the update the devices all access the M5 deco units but some (but not all) can't now "see" the internet.  So my SkyQ box has connection with the network but no internet access.  The Sonos worked fine but since resetting it to fix a different problem, it cannot now access the internet to allow Alexa voice control.

 

connecting directly to the router everything works.

 

Where do I start?  The iPad I'm typing on is connected to the same M5 but has full internet access, so it's not every device. 

 

thanks

david

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#1
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1 Accepted Solution
Re:Deco mesh has some devices unable to access internet following firmware-Solution
Yesterday - last edited Yesterday

Update：

Hi All,

Based on the feedback we have received, there are three types of Security Attack notifications:

  • CNC Classification and the blocked IP is 194.168.4.100

It is dedicated to Virgin Media users, and 194.168.4.100 is one of the ISP's DNS servers. Usually, this security alert would not affect normal internet activities. In some cases, if users also have a Sky Q box, the Sky Q might be unable to access the internet.  This issue will be fixed via a firmware upgrade soon.

If you need an urgent fix, the following beta firmware has also addressed this issue:

Deco M5_V1/V2/V3 1.9.1_build_20250828_Beta

 

  • Classification: ICMP (CVE-2015-7759) 

  • Classification: SNMP(CVE-2002-0013)

Certain specific data packets accidentally triggered the Security Detection. A fixed patch will be updated in the cloud database in the next few weeks. Once it finishes, users can enable Network Security features again, and these attack notifications will not be triggered.

▶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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#16
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16 Reply
Re:Deco mesh has some devices unable to access internet following firmware
3 weeks ago

  @DavidHall 

Hi, welcome to the community.

Did you set Deco M5 into "Wireless router" mode or "Access Point mode"?

If you check under the Network Security menu, are there any security alerts or any devices under quarantine?

 

Wait for your reply.

Best regads.

▶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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#2
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Re:Deco mesh has some devices unable to access internet following firmware
3 weeks ago

  @David-TP 

 

hi,

 

I am in wireless router mode and, weirdly, almost every device is showing as quarantined (including the iPad I'm using right now) as classification is "CNC".  Do I need to allow these devices and how do I do that?

 

thanks!

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#3
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Re:Deco mesh has some devices unable to access internet following firmware
3 weeks ago

  @DavidHall 

 

I've turned off quarantining as I didn't seem to be able to individually select devices. That's cured the issue, now both the SkyQ box and the Sonos are connected to the Deco network and working properly. 
 

let me know if there's a more sophisticated fix so I can keep quarantining as an option?

 

cheers

David

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#4
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Re:Deco mesh has some devices unable to access internet following firmware
2 weeks ago

  @DavidHall 

Hi, thank you very much for the update.

I'll keep you updated as soon as there is any other solution available.

 

By the way, is there any chance that you can help me save a screenshot that:

almost every device is showing as quarantined (including the iPad I'm using right now) as classification is "CNC"

 

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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#5
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Re:Deco mesh has some devices unable to access internet following firmware
2 weeks ago

  @DavidHall 

 

no problem, here you go.  Google couldn't help with what CNC means 

File:
IMG_0109.pngDownload
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#6
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Re:Deco mesh has some devices unable to access internet following firmware
a week ago

  @David-TP 

 

I have the same issue. Deco os in router mode. How do I see quarantine in deco m5 app. I don't have a network security menu! 

 

The sky box connects if I restart but after not long it goes back to counted but no no Internet 

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#7
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Re:Deco mesh has some devices unable to access internet following firmware
a week ago

  @keano_74-1 once I disable all the real time protection all seems to work ok

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#8
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Re:Deco mesh has some devices unable to access internet following firmware
a week ago - last edited a week ago

  @keano_74-1 

Hi, thanks for the feedback.

May I know your internet service provider?

Could you please refer to this link to help me submit the Deco App log here:

How to submit Deco APP log

 

By the way, before you disable all network protections, have you noticed which protection rule was blocking Sky Q box?

  • Malicious Content Filter
  • Intrusion Prevention System
  • Infected Devices Quarantine

 

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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#9
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Re:Deco mesh has some devices unable to access internet following firmware
a week ago - last edited a week ago

  @David-TP 

 

Hi David

 

I also have this issue, which appears to have started around the time of the recent software update of my Deco M9 system's firmware to 1.9.1

 

All of the devices connected to the network have now been flagged as (repeatedly) quarantined over the last 3 - 4 days. 
 

The reports are the same as the screenshot DavidHall shared - i.e. "This infected device is quarantined, Blocked IP: 194.168.4.100, Classification: CNC".

 

My devices do not appear to have any ongoing problem connecting to the internet and network scans using the TP-Link WiFi Toolkit app come back clean.

 

Is this a bug since the firmware update, or do I need to be concerned that my network is at risk and/or been compromised?

 

Thanks

 

John

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#10
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Re:Deco mesh has some devices unable to access internet following firmware
a week ago

  @JohnJB 

Thank you very much for the update.

May I know your internet service provider? Is it Virgin Media?

Would you please refer to this link to help me submit the Deco APP log?

How to submit Deco APP log

 

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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#11
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