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nal305's profile

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5 Messages

Sunday, April 5th, 2020 2:29 PM

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Dsldevice.domain_not_set.invalid

Ever since recently moving to ATT internet with BGW210 router I have been getting error messages Dsldevice.domain_not_set.invalid error messages

Accepted Solution

Official Solution

New Member

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2 Messages

3 years ago

So much terrible advice in this thread, including by AT&T. I'm a software developer, including web development, of 20+ years who is used to seeing these kinds of things. Hopefully I can help educate the folks on this thread.

TL;DR: There is nothing wrong with your equipment or its settings. Your internet connection is down and your modem is hijacking outgoing HTTPS connections. Once your internet connection comes back, the modem will no longer perform this behavior.

In-depth answer:

Various apps like browsers and Zoom use a protocol known as HTTPS. This protocol requires that your client device (PC, phone, etc.) and the remote server negotiate a secure, encrypted connection. Part of this negotiation is the server presenting the app with a certificate. The certificate will be issued for the domain name your computer is trying to access. For example, when your internet connection is working, connecting a browser to https://att.com will result in the server presenting a certificate for att.com, which is both trusted by a so-called "trusted certificate authority" and is also issued for att.com. Because the certificate is trusted and its domain name matches the domain name you are attempting to connect to, the browser allows the connection.

Your problem arose because the AT&T modem, often a brand like Arris, detects that there is no internet connection and intercepts these outgoing HTTPS connection attempts. Instead of not responding at all, which I argue is the more secure option, the Arris modem responds with a so-called "self-signed" certificate--named this way because the certificate was not issued by a trusted certificate authority like the real https://att.com certificate. Not only is the certificate not trusted, but it's also issued for the domain name dsldevice.domain_not_set.invalid, which, of course, doesn't match the domain name your client device is attempting to connect to. This results in scary warnings, popups, etc. These warnings differ from app to app, but they almost always prevent any further activity on the connection. This is for security reasons because sometimes malicious actors can man-in-the-middle a connection attempt between your client device and a server and attempt to provide a fake certificate. Most modern apps are programmed to handle these mismatches and prevent you from continuing to use the connection.

For example, here is Zoom's warning window that shows the self-signed certificate, its domain name (called a common name in certificate parlance), and who it was issued by. You can see the issuer is Arris, who is the manufacturer of my modem. Ignore the "The certificate is valid" with a green checkmark; the certificate is "valid" in the sense that it is well-formed, but it is invalid in the sense that it was not signed by a trusted certificate authority and is issued for a mismatched domain name (Zoom really should not report self-signed certificates as "valid.")

(edited)

Community Support

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231.2K Messages

4 years ago

Hi @nal305,

 

From what I've found, it looks like it is a mismatch on the network settings, but most people say it's not worth trying to correct if everything is working fine. If you do want to investigate it further, try removing any 3rd party equipment from your setup to see if you have this issue. Also, doing a factory reset on the gateway may help with correcting some of the configurations.

 

David, AT&T Community Specialist

Contributor

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5 Messages

i seem to have been able to fix it. It turns out the errors were generated when using Outlook email connection on my iOS devices. By disabling SSL in the advanced options of the email account settings , the error messages have stopped. Thanks for your response.

Community Support

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231.2K Messages

We're glad to hear you were able to resolve your issue, @nal305!

 

If you ever need any further assistance, don't hesitate to reach back out. We'll be here, and more than happy to help!

 

Donovan, AT&T Community Specialist

Still need help? Ask a question! Our 1.4 million members typically respond within 1 hour.

*I am an AT&T employee, and the postings on this site are my own and don't necessarily represent AT&T's position, strategies or opinions.

New Member

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3 Messages

I am having the same error message, only when browsing websites.

I will click a link, or load a page, and get a certificate mismatch error, or that the site may be trying to steal my data.

If I have it show me the certificate, it is issued to Dsldevice.domain_not_set.invalid, and issued by Dsldevice.domain_not_set.invalid. With an experation date of 5/29/2025.

It doesn't happen all the time, but when it happens, it does it on every device trying to access the internet at that moment.

If I let it try to open the 'suspect' website, it loads the BGW210-700 Device Status page instead of the intended page.

I've worked with support, and they have updated the firmware on the modem, reset the modem to factory, and even gone as far as replaceing the modem.

But the issue is still occuring.

New Member

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10 Messages

@MikeB7332 I've also been having this problem since switching to AT&T recently. Let me know if you found a solution to this please!

(The action suggested by @nal305 above, disabling encryption, does not seem like a correct or safe solution.)

New Member

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3 Messages

They have sent me two new modems..

The first replacement was worse than the original.

The one I got yesterday is better that the one before it, but it's still not good.

I work on a IT help desk for a nation wide company, and I'm seeing this issue with many co-workers with AT&T for thier ISP.

Skype and Teams lose connection, VPN disconnects, certificate errors, our endpoint security software thinks its behind a captive portal, VOIP calls cut out.

I have not attempted to contact support yet today to let them know I'm still having this issue after the third modem.

At this point, it's hard for me to belive it's the modem that is causing this.

And you are right @mnutsch , disabling SSL is NOT a good answer. Or even POSSIBLE in many cases.

Scholar

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3.8K Messages

3 years ago

@nathanaldensr 

Well it was so helpful for you to dig up a thread from last year (April 5th, 2020) to explain a non-problem but thanks

Dave

New Member

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2 Messages

3 years ago

The thread's topic applies just as much today as when it was originally posted. I ran into this when my ONT wire broke the other day, and others will continue to see it as long as AT&T is providing Arris modems that exhibit this behavior. It's also not a "non-problem," as evidenced by the existence of the thread and the confusion about what's going on.

New Member

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2 Messages

3 years ago

Thanks for the reply Nathan, it helped me understand the issue. Ignore Dave's unnecessary snark.

New Member

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1 Message

3 years ago

Nathan, I want to chime in and thank you for your post.  Like Justindupree, it helped me understand an issue I am having with ATT's service.  As context: Last week I received a new Arris BGW320 modem from ATT ... which was an upgrade provided by ATT due to repeated and (to me) inexplicable system failures with the prior hardware.  And I have this exact problem, replete with dropped videoconference calls - and the issues affect both mac and pc computers.  

Apparently no good deed goes unpunished, though?  

It would be great if ATT could acknowledge this issue, and try to solve it ... and not leave it to folks in the forums to explain what's going on.  Please?    

ACE - Expert

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34.9K Messages

3 years ago

The issue is the failed connection.  AT&T is trying to be cute about telling you that rather than just letting the chips fall where they may and you getting a timeout in your browser.  The only solution (now that TLS is pretty much ubiquitous), is to quit trying to be cute.

OTOH, fixing the connection issue is far the more important thing here.

New Member

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2 Messages

3 years ago

For what it's worth, after a replacement modem and some new fiber, the issue is gone. So while it seems relatively obvious in retrospect that it was connection dropping, the new hardware confirms it.

New Member

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1 Message

2 years ago

Nathan, I’ve had 2 different AT&T service techs come out to fix this same issue and I still get the cert issue problems you explained so well. The 2nd tech got rid of the modem the first tech put in and replaced the gateway for the incoming ATT fiber connection with a Nokia BGW320-505. How did you finally get these cert problems to go away? I’m still very surprised that AT&T don’t chime in on this forum with the answer. I may just have to switch back to Spectrum.

ACE - Expert

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34.9K Messages

2 years ago

What do you expect AT&T to "chime in" with?  The underlying issue is that you've lost your Internet connection.  Get it back online.

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