Diagnosing intermittent "can't find IP" errors

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Intermittent connectivity issues are being experienced, primarily manifesting as DNS errors where websites cannot be reached, particularly on Chrome running on a Windows 10 laptop. The problem appears sporadic, resolving itself after brief waits, suggesting a DNS resolution failure rather than a hardware issue. Speed tests indicate normal throughput, and ping times are acceptable, indicating that the issue is likely not related to the internet connection itself. Potential causes discussed include DNS server problems, possible interference from other devices, and issues with the router or firewall settings. Some users have suggested using alternative DNS servers, such as Google's 8.8.8.8, to mitigate the problem. Others have noted that clearing browser cache and resetting network settings may help. The discussion also highlights that external factors, such as ISP issues or even physical damage to cables, could contribute to these connectivity problems. Users are encouraged to conduct further diagnostics, including checking for DNS server responsiveness and ensuring no cached data is causing conflicts.
  • #31
Tom.G said:
suddenly PF didn't respond.
I've had the same sort of thing. I blamed the PF server but perhaps I was being hasty. At least it wasn't my Bank and PF can always wait without the World ending.
 
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  • #32
You can always check this source for recent attacks. Sometimes, you see spikes on specific days.

https://www.akamai.com/us/en/resources/our-thinking/state-of-the-internet-report/web-attack-visualization.jsp

Here's data from the past week.
1574081910623.png

1574081975490.png


1574082070601.png
 
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  • #33
You can filter the Akamai report. Here's one on power grid attacks last week (my personal interest)

1574082391941.png
 
  • #34
It's still happening but good to know there are likely external causes.

At least it wasn't PF, and my bank can always wait without the World ending. :-p
 
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  • #35
I recently had an intermittent DNS problem. My router has a setting to put a "The internet is down" page up when the internet is down. What it supposed to do is return an ip that the router can serve the error page on.

The IP was 10.0.0.1 or something close.

The problem is that the error page is not there and the all DNS entries gets cached and stuck on the non-existent server address. Ping to an IP address works just fine since the outages were seconds in duration. I found the answer on a 5 year old forum post. Just disable the completely broken "feature".

BoB
 
  • #36
Most of the time "site cannot be reached" or "unable to connect this site" come because of dns_probe_finished_nxdomain which means because of DNS. There can be many other reason as well
like you can try following steps
  1. Reboot your modem and Computer
  2. Reset chrome flags by resetting to default if your are using chrome
  3. Check your Host file, if the website you are opening is listed under host file you won't be able to connect
  4. flush your DNS
  5. Reset browser
You can read this article for brief troubleshooting steps on how to Fix dns_probe_finished_nxdomain
 
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