Xfinity No Ranging Response Received – T3 Time-Out [Solved]

Marc Ray

by Marc Ray

Last Updated on

Xfinity: No Ranging Response Received – T3 Time-Out (Solved)

As an Xfinity consumer frequently encountering network outages and high ping issues in games like Valorant, I understand the frustration of modem errors like ‘No ranging response received: T3 timeout.

Moreover, I was a quarter away from witnessing Japan’s triumph at “Japan vs. Germany” in Fifa World Cup 2022, but my modem had other ideas!

I was facing an error from my modem saying, “No ranging response received: T3 timeout.”

As a tech writer who often covers topics like smart homes and the Internet, I had never faced this error before.

Using my technical knowledge and quick learning tactics, I resolved the issue in under 15 minutes, just in time to witness Takuma Asano make history in the Fifa World Cup.

What is Xfinity’s No Ranging Response Received – T3 Time-Out error, and why it occurs?

Damaged cables, insufficient modem power, improperly wired Internet, incorrectly configured devices, and unreliable Internet signals may all contribute to the “No ranging response received: T3 timeout” error on your Xfinity modem.

Try restarting your modem when it occurs, and checking for broken cables may help.

Let’s dive deeper into the error causes and solutions!

Causes of the ‘No Ranging Response Received – T3 Timeout’ Error

Why does the "No Ranging Response Receive - T3 Timeout" Error Occur?

This error is one of five DOCSIS (Data Over Cable Service Interface Specification) Timeout notifications that may appear on router reports because of cable modem problems.


DOCSIS is a standard cable modem protocol that mediates data transmissions between a cable provider and a home or office computer or television.

To explain this error further, I will have to use some technical terms.

To clarify, the modem dispatches 16 data-request packets to the CMTS (Cable Modem Termination System) – a crucial device managing data traffic between consumers and ISPs.

Your modem will then get a ranging response back from the CMTS.

If the modem does not receive the ranging response for any of the 16 requests, you will receive a T3 timeout error.

The error might have happened for various causes, each with its workaround.

Some of the network disruptions which cause the “T3 Timeout” error are:

  • Damaged Splitter
  • A malfunctioning Wi-Fi network
  • Damaged Cables.
  • Faulty nodes from Xfinity’s End
  • Weak Signals
  • Misconfigured CMTS
  • Upstream Noise

Effective Fixes for Xfinity T3 Timeout Error

How to Fix the “No Ranging Response Receive – T3 Timeout” Error?

You are probably aware of the error and what is causing it! Let’s get to the fixes!

1. Restart Your Router and Modem

Whenever you have an issue with a technological device, the first step in troubleshooting should always be to turn off and back on the device.

You will kill all open processes and flush any stored data by power cycling your router and modem. Consequently, it has a significant impact on performance.

To restart, follow these steps:

  1. Login to the Xfinity application on your Phone (available on Apple and Android devices).
  2. Select your modem.
  3. Select “Restart this device.”
  4. Repeat the process for your Xfinity Router.

You can also do it manually if you are not using the Xfinity application or have these devices from some other brand.

Manually restart your devices by unplugging your router and modem from the power outlets. Please wait 30 seconds before plugging them back in to ensure a complete reset.

That’s it! Hopefully, this simple method will resolve the issue, but if not, try other troubleshoots listed below.

2. Replace Damaged Cables

Replace the Damaged Cables

An infrequent source of the “No ranging response received – T3 time-out” error is using low-quality or broken cables.

A series of very small cables accomplish the data transport in internet coaxial cables. Data transmission will be disrupted if these cables get oxidized or worn out.

The cables’ physical condition may also prevent your modem and ISP from exchanging data packets effectively.

Fixing old, frayed wires is a fruitless endeavor. The simplest solution for broken or low-quality cables is to replace them with new ones.

Their long service life and fitness for efficient data transfer justify the higher initial investment in higher-quality cables.

3. Monitor the Upstream Signal Noise

Monitor the Upstream Signal Noise

There’s an upstream channel and a downstream channel on your cable modem. (These channels allow the modem to talk to the CMTS at Xfinity’s end.)

The modem uses the upstream channel to send ranging requests to the CMTS, while the downstream channel receives the response from the ISP.

When the upstream channel experiences interference misconfiguration, low power, poor wiring, or malfunctioning hardware, it will experience impulse noises.

The modem then restarts the registration procedure, clears the cable interface, and connects to the CMTS again.

When your modem’s connection to the CMTS is interrupted by this upstream noise, you’ll get the error “No ranging response received – T3 time-out.”

To monitor your upstream noise, follow these guidelines:

  • Open your browser and access the modem’s admin panel by accessing the gateway IP Address. (The default IP address is written on the back of your modem.) It was for me.
  • Enter the login credentials, which can also be found on the back of your modem.
  • Scroll down to Upstream Power or Upstream SNR (Signal to Noise Ratio.)
  • A Signal to Noise Ratio (SNR) value below 23.5 dB indicates the presence of upstream noise, which can disrupt your connection.

To fix the upstream noise, follow these troubleshoots:

  • Move your modem away from your TV, landline, or other tech devices.
  • Reduce the number of splitters being used.
  • Restart your modem.
  • Upgrade your modem if it is old.
  • Ensure that all of the ethernet cables are correctly plugged inside the connectors.

If any of these troubleshoots don’t increase the value of SNR, contact Xfinity customer care.

4. Check for Service Outages

Check your Xfinity app or SMS for Xfinity outage

A service outage in your location might be the source of the “No ranging response received” error message. You should always be prepared since outages and service disruptions may occur without warning.

If your ISP is Comcast/Xfinity, you should be courteous and timely informed about service disruption.

Since the disruption is from your ISP’s end, there isn’t a simple way to cope with it. You must hold off till your ISP establishes your connection again. But if the disruptions persist, switching to a new ISP may be time.

If you plan to switch your ISP, I have written these guides to help you cancel your Internet.

5. Fix the Modem and Router Wiring

Fix the Modem and Router Wiring

Your cable modem’s inability to connect to the Internet might result from faulty wiring. Due to the CMTS’s failure to receive the modem’s ranging requests, the modem will be unable to make contact.

Fortunately, T3 disconnects due to faulty wiring are easy to repair. Simply checking for improper connections and tangled wires is sufficient.

If you want your network to run more smoothly, check that every cable is plugged into its proper socket and untangle any tangled wires.

6. Update the Modem’s Firmware

Update the Modem's Firmware

It depends on the manufacturer and model of the modem you are using. You can discover tips on updating the firmware of a particular modem on their website, which you may access at any time.

The process of updating the modem’s firmware is virtually always the same across practically all of the most recent models.

  1. Enter the Gateway IP Address on your browser to log in to your modem. (The authorization credentials for the modem are printed on the back side.)
  2. Proceed to the section labeled Update.
  3. Choose “Check for updates,” your modem will search for the most recent firmware and then automatically update itself once it has located it.

You may also do it using the mobile app if you are using an xFi router from Xfinity.

  1. Login to your Xfinity mobile application.
  2. Select your Modem.
  3. Tap on “Update this device.”

That’s it. You are done!

Necessary: Update your router’s firmware following the abovementioned steps.

7. Factory Reset Your Cable Modem and Router

Factory Reset your Cable Modem and Router


Be wary of factory resetting your modem/router, as it will wipe away all the personalized settings. So, write down your network’s password, name, and other credentials before the hard reset.

You must perform the factory reset while your modem and router are plugged in and working.

  1. You’ll need a SIM ejector tool or a pin to access the reset button since it’s buried within a hole and can’t be reached by your finger. (I used my wife’s hairpin in this instance.)
  2. Insert the pin into the hole and hold the reset button for ten seconds. (You’ll hear a clicking sound when you push the button.)
  3. After a reset, the modem and router will be restored to their factory settings, and you’ll need to manually enter the network information you jotted down before the reset.

If you are using an Xfinity modem and router, you can also perform a factory reset from their Admin Tool.

  1. Open up your browser, and to access the admin tool, go to and sign in with the credentials written on the back of your modem and router.
  2. Go to Troubleshooting.
  3. Go to Reset/Restore Gateway.
  4. Select Restore Factory Settings.
Perform a factory reset from their Admin Tool

That’s it! As a result, you’ll need to manually update your network settings, which you’ve previously documented, as your modem will be restored to its factory defaults.

8. Get the Wiring Inspected

Get the Wiring Inspected

I take great pride in my front yard lawn, but unfortunately, rats and raccoons have made it their home.

A raccoon chewed through the main cable from the poles recently, and I was without Internet for an entire weekend. So, It is recommended that a professional do the examination and troubleshooting.

It’s possible that network disruptions like these emerged because of external reasons like bad weather, flooding, animal intrusion, or even internal ones like faulty buildings or fire.

The power levels upstream may rise while those downstream decrease when the ambient temperature is high because of increased cable resistance.

Don’t worry if you haven’t been able to contact Xfinity customer care to schedule an inspection appointment just yet.

If poor wiring or accidental damage prevents you from accessing the Internet, get it checked out by an Xfinity specialist.

9. Upgrade Your Modem and Router

Upgrade your Modem and Router

While we focus primarily on wiring issues, this does not guarantee that the modem and router are still functional.

I suggest substituting a spare modem for the one currently being utilized to do adequate testing.

You know the issue isn’t software-related if it does what it should.

You can always check the modem and router’s activity log file if you want a more in-depth breakdown of your signal strength and error rate. (The SNR and downstream and upstream power levels are shown in the reports.)

Xfinity may provide a free new modem if your current one breaks down while still covered by the manufacturer’s warranty.

A new router or higher-quality coax cables are also viable options. A bidirectional one with a data transmission rate of 5.0–1000 MHz is what I usually advise using.

10. Consider Environmental Factors

If you’ve been using Xfinity Internet for a long time, you know that external variables, like storms and rains, may cause time-out problems.

In severe weather, such as a deluge or hailstorm, you may experience a slowdown or a complete loss of your internet connection. In addition to natural causes, such as tree limbs falling or power lines freezing, bad weather may also cause infrastructure breakdowns and subsequent outages.

Your modem’s connection to the CMTS will be weakened due to these disruptions, and you’ll start getting T3 time-out errors.

Since nature is the cause of this disruption, unfortunately, you can’t resolve this issue on your own, and you will have to wait for the officials (Xfinity People) to fix the damage done by nature.

11. Contact Xfinity Tech Support

Contact Xfinity Tech Support

Even after all these troubleshoots, you may contact Xfinity’s customer care for help with your time-out errors if unsuccessful.

When you get on a call with them, explain the issue and frequency of the T3 time-out error.

They will let you know if you are facing this error because of a service outage, bad weather, or whatever the scene is!

If the issue is not from their end, they will help you reset your modem and troubleshoot it if necessary.

If that doesn’t seem to be the source of the time-out error, Xfinity customer service will schedule a visit from a technician to check out your modem and any splitters.

To get in touch with them, you can either go to their website or call them at the following number: 1-800-XFINITY.


There’s nothing as unpleasant as receiving T3 time-out error messages while enjoying your favorite sports or playing Valorant.

Employ the above strategies proactively to prevent the ‘No Ranging Response Received – T3 Time-Out’ error, ensuring a smooth and uninterrupted Xfinity internet experience.

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About the author

Marc Ray

Marc Ray

Marc Ray, Founder of A tech enthusiast & expert in smart home technology, helping homeowners upgrade their homes with the latest smart home security & automation solutions. Marc has over 10 years of experience in smart home technology. He holds a certification in Home Automation Systems and has been featured in Hubspot. You can learn more about Marc and his work. Read his Book, Smart Home Hacks!

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