Technician helping troubleshoot Motorola phone screen brightness not working

Steve H.

Reviewed for technical accuracy

Specialities: Mobile internet not working with VPN (Android & iPhone), “VPN connected but no internet” checks, Always-on/Block-without-VPN (kill switch) behavior.

VPN turns on but internet stops? Common reasons + what to check first (safe, no resets)

Technician avatar Technician
I’m here with you. When a phone goes “offline” the moment a VPN is enabled, it can feel scary — but it’s often a protective setting (a kill switch) or a DNS conflict, not a damaged device.

Trust moment: Let’s keep this calm and safe. No factory resets, no “wipe everything,” and we won’t change multiple settings at once.

To aim in the right direction: did this start after a phone update, a VPN app update, or switching carriers/SIM/eSIM? And are you on Android or iPhone?
Customer
Android. It started yesterday after the VPN updated. Without VPN, mobile internet is fine. With VPN on, nothing loads.
Technician avatar Technician
That update timing is a strong clue. Quick safe checks first:
• When the VPN is ON, does it show Connected or does it spin/loop?
• Does this happen on mobile data only, on Wi-Fi only, or on both?

If it works on Wi-Fi but not cellular (or the other way around), that points to a network-specific issue (carrier settings, IPv6, or APN) rather than the whole phone.
Customer
VPN says connected. It fails on both Wi-Fi and mobile data. I also turned on “Always-on VPN” a while ago.
Technician avatar Technician
Helpful detail. On Android there’s a second switch that often travels with Always-on: “Block connections without VPN” (sometimes called lockdown). If it’s enabled and the VPN tunnel is not actually usable, the phone can look completely offline even while it says “connected.”

Trust moment: I don’t want you to turn off protections blindly. We’ll just check what’s enabled so we understand why the phone behaves this way.

Can you open Settings → Network & internet → VPN, tap the gear next to your VPN, and tell me whether you see:
• Always-on VPN: ON/OFF
• Block connections without VPN: ON/OFF
Customer
Always-on is ON. Block connections without VPN is ON too.
Technician avatar Technician
That combination explains the “everything is dead” feeling. Now we need one more safe observation to avoid guessing.

With VPN ON, try opening a simple site in your browser and note what you see:
• “No internet” / “DNS address could not be found”
• “This site can’t be reached” (timeout)
• or a login/captive portal page that won’t finish loading

The exact message helps separate a DNS problem from a tunnel routing problem.
Customer
It says “DNS address could not be found.” And apps act like there’s no connection.
Technician avatar Technician
That points strongly to DNS. Two common causes on Android:
1) Private DNS (DNS-over-TLS) set to a custom provider that doesn’t play nicely with the VPN after an update.
2) Two “network filtering” apps at the same time (VPN + ad blocker / firewall style app) competing for DNS and routing.

Safe check: go to Settings → Network & internet → Private DNS. What is it set to — Off, Automatic, or Private DNS provider hostname?
Customer
It’s set to a Private DNS provider hostname. I set it months ago because someone recommended it.
Technician avatar Technician
That makes sense — and it’s a frequent “surprise” after updates. The key idea: you can have a perfectly good VPN, but if DNS lookups fail, the internet feels broken because websites can’t be found.

Trust moment: I don’t want you to delete your VPN profile or lose saved settings. First we confirm which layer is failing (DNS vs the VPN tunnel).

Another safe question: do you also run an ad blocker, firewall, or “DNS app” that uses a local VPN slot? On Android, only one VPN-based filter can usually be active at a time.
Customer
Yes, I have an ad blocker app. I didn’t think it mattered. Could that be the whole issue?
Technician avatar Technician
It very well could be part of it, especially if both are trying to control DNS or routing. Some ad blockers operate as a “local VPN,” which can conflict with your main VPN app — the phone ends up with a tunnel that says connected but can’t actually resolve traffic.

One more safe check for clues: in your VPN app, is there a setting called Kill switch, Block outside VPN, or Lockdown? That’s separate from Android’s own “block connections without VPN,” and either one can cut off internet if the VPN can’t complete properly.
Customer
It has a kill switch setting and it’s enabled. Also I’m worried: if I change anything, will I break my bank app or make my phone unsafe?
Technician avatar Technician
That’s a fair worry. Banking apps can be sensitive to VPNs, but what you’re describing is broader: everything stops working, and the browser reports DNS failure.

The safe approach is to make only reversible tests and watch the result. For example, testing whether the issue disappears when one layer is paused (Private DNS, a second filtering app, or the “block without VPN” mode) helps confirm the cause without “opening you up” long-term.

If your goal is “VPN for privacy but keep normal internet,” we can also look at split tunneling later — that lets certain apps bypass the VPN when necessary (common for banking, work apps, or Wi-Fi calling).
Customer
Ok. Another detail: I’m on a new carrier and switched to eSIM last week. Does that matter with VPN?
Technician avatar Technician
Yes — good catch. A carrier switch can introduce differences in IPv6 handling and sometimes APN settings. Most of the time phones handle that automatically, but a VPN can expose edge cases (for example, the VPN expects IPv4-only, or the network prefers IPv6 and something in DNS/routing gets confused).

That’s why we’re not jumping straight to “reinstall everything.” We’re building a simple map: update timing + Always-on/Block mode + Private DNS + possible second VPN-based ad blocker + new carrier changes.

If you tell me whether the same “VPN = no internet” happens on a completely different Wi-Fi network (like a friend’s or a cafe), that also helps separate carrier factors from phone/VPN settings.
Customer
I tried my home Wi-Fi and my neighbor’s Wi-Fi. Same problem. VPN on = no internet.
Technician avatar Technician
That makes it very likely a settings-layer conflict (DNS / kill switch / competing filter), not the carrier or the router.

Here’s the safe “what to check first” order (no big changes, and only one item at a time):
1) Confirm Android VPN settings: Always-on + Block-without-VPN are enabled (we already did).
2) Check Private DNS mode (custom hostname is a common trigger).
3) Check whether another app is using a “local VPN” (ad blocker/firewall).
4) Check the VPN app’s own kill switch and whether it changed after the update.

If you share just two items — your Private DNS setting and whether a second filtering app is active — we can narrow the cause without trial-and-error.
Customer
That helps. I’ll look at Private DNS and the ad blocker settings first. I don’t want to start flipping lots of switches.

Quick answer: the accepted fix

Accepted first approach when mobile phone internet stops with VPN enabled: treat it like a “layer conflict” and confirm the simplest blockers before assuming your phone or carrier is broken.

What’s usually worth checking (safe, reversible):
• Review Always-on VPN and Block connections without VPN to understand why everything is being stopped when the tunnel isn’t usable.
• Check Private DNS (especially a custom provider hostname), because DNS failure can look like total internet loss.
• Make sure you don’t have two apps trying to run “VPN-style” filtering at the same time (VPN + ad blocker/firewall).
• Look for a VPN-app kill switch setting that may have changed behavior after an update.
• If you see a managed/work profile or a configuration profile, pause and follow the organization’s guidance before changing network controls.

Why a VPN can make your phone look offline (even when it says “connected”)

A phone can show a VPN as “connected” while something important is still failing underneath. The most common patterns are a kill switch blocking traffic until the tunnel is fully usable, a DNS problem (sites can’t be found), or two network tools competing (a VPN plus an ad blocker/firewall using a local VPN). Updates can also change permissions, battery/background limits, or how the VPN app starts in the background. If the problem happens on every Wi-Fi network and on cellular data, it often points to device-level settings (VPN mode, Private DNS, app conflict) rather than your router or carrier.

What to check first: Always-on/kill switch, Private DNS, split tunneling, or carrier settings

Start with the safest checks that don’t erase anything: confirm whether Android’s “Block connections without VPN” is enabled, then check if Private DNS is set to a custom hostname. If you use an ad blocker or firewall that runs as a local VPN, it may conflict with your main VPN and cause “VPN connected but no internet.” If only certain apps fail, split tunneling may be relevant later (some apps don’t behave well behind a VPN). If it only fails on mobile data, then carrier details like IPv6 behavior or APN settings become more likely — but it’s best to rule out the device-level blockers first.

iPhone battery percentage wrong — gentle troubleshooting tips

Most “wrong percentage” cases are caused by iOS reporting, Battery Health aging, or a charger/cable mismatch.

Best approach: compare behavior on a known-good charger, review Battery Health for any warning, and restart once at a calm time to refresh iOS reporting. If it began after an update, give the phone time to settle and avoid changing many settings at once. Take note of patterns (only while charging, only at certain percentages, or sudden drops) because that points to the real cause faster. If you ever see heat, swelling, or unexpected shutdowns, stop and follow manufacturer guidance before trying more steps.

Disclaimer: This information is AI-generated and intended for general guidance only. Avoid making multiple system changes at once. For device-specific steps, consult a verified expert on Whizz-Tech or the manufacturer’s support before making decisions.

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FAQ

Why did my mobile internet stop working right after a VPN update?

Updates can change how the VPN starts, how DNS is handled, or how a kill switch behaves. If “block connections without VPN” is enabled, your phone may block all traffic until the VPN tunnel is truly usable. A DNS conflict can also make everything look offline. It’s usually safest to check one layer at a time.

VPN says connected but I have no internet — is that a phone problem or the VPN?

Often it’s a settings-layer problem rather than hardware. DNS failures, a kill switch, or two filtering apps competing can produce “connected but no internet.” If the issue happens on every Wi-Fi network and on cellular, it usually points to device settings or app conflict. If it only happens on mobile data, carrier factors become more likely.

Did this happen because I turned on “Block connections without VPN” (Always-on)?

It can. That setting is designed to prevent any traffic from leaking outside the VPN. If the VPN tunnel isn’t working properly after an update, the phone may block everything. This is why it can feel like the internet “dies” instantly. Checking that setting explains the behavior without assuming something is broken.

Can I check this safely at home without resetting my phone?

Yes. You can safely review VPN mode settings, check Private DNS, and confirm whether another app is using a local VPN. You can also test on another Wi-Fi network to rule out the router. Avoid changing multiple items at once so you can tell what actually helped. If your phone is managed by work/school, follow their guidance before altering VPN controls.

Sources

Filed under: VPN, Network Blocks & Policies

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