What is QOS-THROTTLE?
Connection speed limiter (QoS) error is a medium-severity network adapter issue. Quality of Service on the router or in Windows inadvertently limits the speed to a fraction of the maximum. Common triggers are ISP Provider Error, corrupt network card driver and IP address conflict. Work through the steps below in order.
Common Causes
- ISP Provider Error
- Corrupt network card driver
- Stuck Router
- IP address conflict
Step-by-Step Fix Guide
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1
Restart the router (turn off for 1 minute)
The highest-success first step is Restart the router (turn off for 1 minute), which targets the most common trigger behind QOS-THROTTLE.
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2
Reset complete network settings in Windows
Should the issue continue afterward, the remaining steps are there to cover the less common network instability scenarios.
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3
Change the DNS servers to 8.8.8.8
Try "Change the DNS servers to 8.8.8.8" next if the issue persists — it addresses a secondary cause.
Commands & Diagnostics
ipconfig /release
ipconfig /renew
ipconfig /flushdns
netsh winsock reset
Frequently Asked Questions
ISP Provider Error accounts for the majority of QOS-THROTTLE reports; corrupt network card driver, stuck Router and IP address conflict come up less often but are documented.
Most QOS-THROTTLE reports resolve after "Restart the router (turn off for 1 minute)". The rest of the guide above is there for the cases that don't.
As a medium-severity issue, QOS-THROTTLE is more of a stability annoyance than a hardware risk — the steps above should clear it up.
Usually. QOS-THROTTLE is fixable with the steps above; a full Windows reinstall is rarely necessary unless everything else has failed.
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