No connection to internet (or router) after some uptime

HolyFire

Member
Nov 8, 2008
34
0
66
Hi all, I hope you can help with a weird connection problem I'm having lately.

Basically, everything is working fine until suddenly the internet connection stops working. Most notably, I can't go to any websites (on either Firefox or Chrome).

The only way I can resolve it is by restarting Windows. Then everything goes back to normal, until next time. Things like restarting the router don't help.

When this happens, I can't even connect to my router (which I usually do by putting its local IP address in Firefox).

This seems to affect only my computer, and not any other computers connected to the router. Also, I've seen it happen with the same computer in two different locations (in two different cities), each with its own internet connection and router, so it seems to be a problem specifically with the computer and not with the infrastructure, ISP, router etc.

The connection to the router is through a physical RJ45 cable, and not WiFi or anything like that.

I haven't been able to identify any particular thing that triggers this. It just happens after my computer has been up for about 2 days.

To expand on the symptoms - despite what I've said, it doesn't seem correct that there's no connection at all. Rather, it seems to be extremely slow, measured perhaps in several bytes per second. So if I was already connected to a website like, say, StackExchange, I can sometimes do actions that don't require loading a new page (like posting a comment). But I can't load any pages.

Specifically, in Firefox, when I put in a URL, absolutely nothing happens. No indication that it's trying to load, no progress bar, no error message, nothing. On Chrome I get an error message.

Before the problem manifests in full, I often get a "warning" in way of Firefox managing to load a webpage, but without the css, images, etc. But soon after even the text won't load.

Hopefully it's a software thing which can be easily fixed... If it's hardware, I guess I can get a PCIe network card, as I don't want to bother with replacing the motherboard.

Thanks!

Some possibly relevant details:
OS: Windows 7 professional 64-bit
Motherboard: ASUS Maximus VII Hero (https://www.asus.com/Motherboards/MAXIMUS_VII_HERO/overview/)
Description of LAN card from motherboard website:
Intel® I218V, 1 x Gigabit LAN Controller(s), featuring GAMEFIRST III
Intel® LAN- Dual interconnect between the Integrated LAN controller and Physical Layer (PHY)
Anti-surge LANGuard
 

HolyFire

Member
Nov 8, 2008
34
0
66
I don't think it's overheating per se - it happens when the machine is in a cool environment without much load. But I can't rule out the possibility that the problem started due to permanent damage caused by an instance of overheating.

I'll try updating drivers, though I can't say I'm very optimistic this will fix the problem.
 

ch33zw1z

Lifer
Nov 4, 2004
39,039
19,731
146
If drivers don't fix it, and the problem is easily recreatable, try a live version of Linux or a second hard drive and install Linux. If it still does it in Linux, it's a hardware problem. If that's outside the scope of what you're willing to try, then just grab an expansion nic and test with that.
 

HolyFire

Member
Nov 8, 2008
34
0
66
Update: I finally managed to acquire and test a PCIe expansion NIC. Same problem - after 2 days of uptime, the network connection stops working correctly.

So it doesn't seem to be a hardware problem (or, if it is, it is a very weird problem).

So that leaves software... But I'm having a hard time figuring out what kind of software problem. I don't remember checking the "disconnect internet after 2 days of uptime" option. Notably, the "2 days uptime" seems to be very regular, I didn't see that it matters what I am doing with the computer (if at all) during that time.

Is some kind of malware a likely explanation?

Any other ideas for what to test or how to fix?
 

VirtualLarry

No Lifer
Aug 25, 2001
56,570
10,202
126
Sounds like some sort of DHCP renewal request issue to me. That it's not getting the DHCPRENEW packets back.
 

HolyFire

Member
Nov 8, 2008
34
0
66

mxnerd

Diamond Member
Jul 6, 2007
6,799
1,103
126
You never mentioned brand/model of your router. Have you update it's firmware?

Is it compatible with DD-WRT? If yes, try to load DD-WRT to see if it solves the problem.
 
Last edited:

Ketchup

Elite Member
Sep 1, 2002
14,558
248
106
Have you flushed your DNS cache on that PC?

From an elevated command prompt:

ipconfig /flushdns

While you are there, go ahead and run:
ipconfig /release
ipconfig /renew

Let us know if the problem returns.
 

Parkardavid

Junior Member
Nov 15, 2018
1
0
6
last month I faced the same issue. There was internet connection but it was showing no internet. I contacted with the service provider and they instructed me to check the router settings and also instructed me to keep patience. And it got recovered automatically.
I will also recommend you to keep patience and wait for some days.