Opera seems to break my internet
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burnout426 Volunteer last edited by
In Opera, you can goto the URL
opera://settings/systemand enable "DNS over HTTPS" and set it to Cloudflare to test if that helps.Also consider that maybe there's an issue with the router itself but only Opera is able to expose it. If the router comes with your internet service, maybe you can get your ISP to replace it to see if that helps.
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Himmelsschlingel last edited by Himmelsschlingel@burnout426 First of all thank you for your help.
Actually I changed the settings in Opera both desktop and Android alike to: DNS over HTTPS via Cloudfare right after installation. I just thought that it was right that, that caused the trouble. But disabling it, didn't help either.
I haven't made a test on another Chromium browser yet. But I remember a time when I had another ISP with some other hardware (router and a Linux laptop in this case) I saw some similar behavior when using Vivaldi. I saw some other people posting similar issues on their forum then.
Actually, my impression is that it doesn't generally happen with Opera but only on specific versions and it seems to me, that it's version 128 on desktop or the respective version on Android that might be causing the trouble.
Yet, I threw it at Gemini and apart from the VPN thing it gave me this answer:
The FritzBox Reaction: Some FritzBox firmware versions have a security feature called "DNS Rebind Protection" or automated DoS (Denial of Service) protection. If Opera attempts to open hundreds of simultaneous connections to a single proxy IP to "speed up" loading, the FritzBox might flag this as suspicious activity and temporarily throttle or drop the connection to protect the network.
2. Synchronization Stress
You mentioned a "fresh install" on Mac, iPad, and Android all at once.
When you sign into an Opera account on three devices simultaneously, they immediately begin a massive sync of bookmarks, history, open tabs, and extensions.
If your FritzBox 6660 is running older firmware, the sudden burst of "Stateful Packet Inspection" (checking every single one of those sync packets) can occasionally cause the router's NAT table to overflow, leading to a hang that requires a reboot.3. BitTorrent / Flow Integration
Opera has built-in features like Opera Flow and, in some versions, native support for certain file-sharing protocols.
Unlike Firefox, which is very "standard" in its traffic patterns, Opera’s sidebar features and "My Flow" use a specific type of peer-to-peer (P2P) communication to keep devices in sync.
Cable routers (like the 6660) are notoriously sensitive to high numbers of UDP connections typically used by P2P protocols. If the router's processor spikes to 100% trying to manage these, it will keep the Wi-Fi alive but stop routing internet traffic.I haven't changed the settings in the FritzBox itself yet as it's working for Firefox now. But I may do that in a while.
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burnout426 Volunteer last edited by
@Himmelsschlingel Yeah, I saw some stuff on Google about DNS Rebind Protection too.
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Himmelsschlingel last edited by
@burnout426 Eventually, I found out, that the problem is not associated with Opera but as you said, it only turned out when I used it. It's a problem with DNS resolving, indeed, but it was happening with Firefox or Brave as well.
My ISP advised me to make a complete reset, so I'll hope that the issues are gone now. Thank you for you help, nevertheless. You're advice is very welcome.
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Himmelsschlingel last edited by Himmelsschlingel
Unfortunately, the issue reoccured. I'd only used Firefox after the hard reset of my FritzBox for a week, just to make sure not to have any issues.
So, I dared to install Opera again. And it lasted half a day, when the same problem appeared again. No connection to the Internet for any device, although the router didn't show any visible error message of a broken internet connection.
As I'm having no clue what actually causes the problem, I'll stay away from Opera for some time, unfortunately.If I ask Gemini, it tells me roughly the same again: too many connections made by Opera at once. And gives me the following advice:
- Turn out DoH in the browser
- Disconnect synchronisation and/or Flow
- Disable some filter lists in the ad blocker
I actually would do that in the future, but at the moment I'm really fed up as last time resetting the router took me at least an hour, especially with all devices in need to be connected again.
Have I already said, that this behavior only appeared with version 128? Although I've seen some minor issues of this kind with earlier versions as well.
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Referenced by Himmelsschlingel
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Mlipka Opera last edited by@Himmelsschlingel Thanks for reporting and apologies for late reply.
There are many details in this thread, so let me consult this internally and see if we can add something to this discussion.
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Mlipka Opera last edited by
Ok, so what I got from our engineers:
"Please use a clean profile, as it appears that DNS over HTTPS (DOH) was the original cause of the issue. DOH is not activated in a clean profile, so although you mentioned turning it off, we can only be certain by testing with a clean profile.
If the problem persists, please confirm whether you have activated the free VPN, as this can also trigger the behavior affecting your router."
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Mlipka Opera last edited by
Regarding version 128. The new stable version has been released for Developer on Monday and today it will be released for Stable.
More info: https://blogs.opera.com/desktop/2026/02/opera-128-stable/
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Himmelsschlingel last edited by
@Mlipka said in Opera seems to break my internet:
Ok, so what I got from our engineers:
"Please use a clean profile, as it appears that DNS over HTTPS (DOH) was the original cause of the issue. DOH is not activated in a clean profile, so although you mentioned turning it off, we can only be certain by testing with a clean profile.
If the problem persists, please confirm whether you have activated the free VPN, as this can also trigger the behavior affecting your router."
That seemed to be the problem. I didn’t change the DoH setting after the fresh install and I haven‘t had an issue so far.
