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June 24th, 2025 22:14
Dell XPS 9500 Wi-Fi connection randomly stops working, even trying with an external card, until reboot
Hi everyone,
I’m dealing with a frustrating and seemingly random Wi-Fi issue on my Dell XPS 9500 (Service Tag: <Private data removed from public view. DELL-Admin>), running fully updated Windows 11.
The problem started about a month ago. Every time I leave the computer on overnight (plugged in and set not to sleep), I wake up to find that the system shows it’s still connected to Wi-Fi, but there’s no actual internet access. I can ping external sites like google.com, but no browser loads anything and no app that requires internet works.
This is not a sleep issue. The screen just turns off, and when I move the mouse, the session resumes immediately — no login delay or signs of resume from sleep. Everything appears fine, but internet connectivity is broken.
Sometimes disabling and re-enabling the adapter restores the connection, but most of the time it doesn’t. The only reliable fix is restarting the system.
Here’s a list of what I’ve tried so far:
- I did a clean install of Windows 11.
- I bought a new USB Wi-Fi adapter (TP-Link Archer T3U Nano) and disabled the internal Killer AX1650s. I only left the new adapter active (Wi-Fi 2), and the exact same issue happened.
- I changed all power management settings, including:
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- Disabling “Allow the computer to turn off this device to save power” for all network devices (including hidden ones).
- Adjusting advanced power plan settings (USB selective suspend, wireless adapter power saving, etc.).
- Following ChatGPT’s suggestions to make sure no energy saving option interferes.
- I disabled Modern Standby (S0) and re-enabled legacy S3 sleep state via registry and BIOS.
- I uninstalled all Killer-related software, including the Performance Suite and any monitoring tools.
- I scheduled regular adapter resets with Task Scheduler during the night, just in case that helped. It didn’t.
- I confirmed that the PC is set to never go to sleep when plugged in.
Despite all of this, the issue keeps happening. It affects both the built-in and the external adapter in the exact same way, which makes me think it might be something deeper in Windows or a firmware/driver regression. I’ve also verified that other devices in the same network continue to have internet access with no issues.
I’m honestly out of ideas. Has anyone seen something similar or found a real solution?
Thanks,
Juan
juaninacio
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11 Posts
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June 27th, 2025 21:19
[SOLVED] Port Exhaustion / TCP 4227 Errors / No Internet After Idle
After nearly a month dealing with random internet loss every morning, I finally figured it out. Posting here in case it helps someone else!
Symptoms:
Windows loses internet connectivity overnight
DHCP Client logs errors (Event ID 50104)
netstatshows thousands of TCP ports in BOUND or TIME_WAIT stateSystem Event Log shows: "A request to allocate an ephemeral port number from the global TCP port space has failed due to all such ports being in use" (Event ID 4231)
Reboot is the only thing that restores connectivity
Happens regardless of Ethernet or Wi-Fi
All VPN and backup software was removed but didn’t help
What I tried:
Flushed DNS, reset Winsock, reset IPv4 settings
Disabled IPv6, Teredo, QoS
Updated all drivers and Windows
Reinstalled Windows entirely
Uninstalled VPN tools, backup tools, file sync tools
Scanned for malware with Malwarebytes and Defender
Checked router settings, tried different networks
Disabled everything in MSConfig startup
Applied registry tweaks for ephemeral port range and TIME_WAIT delay
Tried to run regular tasks that sent pings or restarted the network adapter
Monitored the network overnight with
netstat, TCPView, and PowerShell scriptsFinal clue came from this PowerShell command:
One process (PID 4476) had over 10,000 ports in BOUND state. It belonged to:
C:\Program Files (x86)\MyPublicWiFi\PublicWiFiService.exeProduct version: 31.2.0.0
Publisher: Azzouzi Software (Germany)
I had installed "MyPublicWiFi" about a month ago. Turns out this app was binding thousands of ports silently in the background.
Solution:
Uninstalled MyPublicWiFi
Problem disappeared immediately
No more port exhaustion
Internet works fine after idle
No more 4231 or DHCP client errors
Posting this because the issue was obscure and nothing pointed to this app being the cause. Hope it saves someone else hours of debugging. I installed this program to share my computer’s Wi-Fi with my phone while using the plane’s Wi-Fi. Ended up creating a much bigger problem just to save $20 on a second connection. Lesson learned.
(edited)
DELL-Jesse L
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June 25th, 2025 10:38
Click here for resolving wifi issues.
To receive assistance from Dell chat support, they need to verify the warranty status and ownership. Then you must troubleshoot with them.
Click the "Get Help Now" icon on the right to start a live chat session. If already out of warranty, click here for the Dell out of warranty offering.
juaninacio
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11 Posts
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June 25th, 2025 17:31
Thanks Jesse. I’m posting here because my XPS 9500 is well out of warranty, but it worked perfectly until about a month ago. Since then, Wi-Fi connectivity randomly drops completely until I reboot.
Given that this happens both with the built-in Killer AX1650s adapter and a brand new TP-Link Archer T3U Nano USB dongle, it doesn’t seem like a hardware issue. I’ve also reinstalled Windows 11 from scratch, updated everything, disabled all sleep/power saving features, uninstalled all Killer software, and adjusted every energy management setting I could find, nothing resolves it.
Would you happen to have any idea what else I could try? I'd appreciate any suggestions.
anne_droid
3 Apprentice
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649 Posts
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June 25th, 2025 21:41
@juaninacio
Hi
Can you check the lease time being given out by your router, and if practicable extend it to at least 5 days.
juaninacio
1 Rookie
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11 Posts
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June 26th, 2025 08:27
@anne_droid , this's happened in three different locations in the last few weeks. I cannot go around places (Im a digital nomad) and change all routers configurations. Plus this was working before, so definitely not a router configuration issue.
Anyway, here's a quick update about this issue
After weeks of waking up every morning to find my XPS 9500 disconnected from the internet, this morning—for the first time—it was still working. No reboot needed, no network reset, nothing.
Last night I tried a few things:
I’m wondering if the fact that this trace was running may have played a role in keeping the connection alive. Could it have prevented the network stack from idling or crashing somehow? If anyone has thoughts on whether it was one of the config changes or the trace command that made the difference, I’d appreciate your insight. I’m hoping this wasn’t just a fluke. But very happy with the results so far. Will add a final update if this doesn't happen for a few days.
(edited)