Technician helping fix an Acer computer that needs frequent restart

Steve H.

Reviewed for technical accuracy

Specialities: Desktop PC VPN connection problems (Windows 10/11), internet stops after VPN connects, “connected but no internet,” DNS issues, VPN kill switch behavior.

Internet problems after using a VPN — common reasons and safe checks (DNS, kill switch, Wi-Fi/Ethernet)

Technician avatar Technician
Hi! Let’s keep this safe and simple first — I don’t want you changing advanced network settings “just to try things.”

VPN connection issues on a desktop usually come from one of these:
1) The VPN is connected, but DNS (how names like “google.com” resolve) is failing
2) A VPN kill switch is blocking internet when the VPN drops or reconnects
3) The VPN changed how traffic routes, so local devices or websites stop working (sometimes called split tunneling or routing rules)
4) A recent Windows update or security app interfered with the VPN network adapter

First, two quick “environment” questions:
• Did this start right after a Windows update, a VPN app update, or changing networks (new router, guest Wi-Fi)?
• When the VPN is OFF, does the desktop browse normally?
Customer
I turned the VPN on and then my internet started acting strange. Some websites won’t load. Sometimes it says I’m connected but nothing works. I’m not very technical and I’m worried I’ll break my computer.
Technician avatar Technician
You’re doing the right thing by pausing. Trust moment: I don’t want you downloading “network fixer” tools or making random changes that are hard to undo.

Let’s narrow it down with the safest test: when you turn the VPN OFF, does everything return to normal (websites load, email works)? Or is it broken even with the VPN off?
Customer
When I turn the VPN off, most things work again. With it on, some sites load and some don’t. My email sometimes spins and never finishes.
Technician avatar Technician
That pattern strongly suggests the VPN itself (or how it’s routing traffic) rather than your router or internet provider.

Quick check (no changes): are you on Wi-Fi or Ethernet right now? And does the problem happen on both, or have you only tried one?
Customer
I’m on Wi-Fi. I haven’t tried Ethernet. It’s a desktop in my home office.
Technician avatar Technician
Understood. Another safe clue: when the VPN is ON and a website won’t load, do you see a message like “DNS server not responding,” “This site can’t be reached,” or is it just an endless loading circle?

Different messages point to different causes (DNS vs routing vs blocked traffic).
Customer
I’ve seen “This site can’t be reached” and sometimes it just spins. I also can’t print to my wireless printer when the VPN is on.
Technician avatar Technician
That’s a very useful detail. Losing access to a home printer or local devices while the VPN is active is common, because some VPNs route all traffic through the tunnel, including local network access.

Trust moment: I don’t want you “toggling everything” inside the VPN app. First we confirm whether this is expected behavior (local network blocked) or a malfunction (internet breaking).

When the VPN is ON, do you still have access to your home router page or local devices at all, or do they all disappear?
Customer
The printer disappears. I also can’t open a shared folder on my other computer. It feels like the VPN “cuts me off” from my own home network.
Technician avatar Technician
That often happens when the VPN is set to “send everything through the VPN,” which can block local network discovery and local addressing.

Another safe question: did this begin recently (new VPN, new settings, update), or has it always behaved this way whenever the VPN is on?
Customer
It started recently. I think there was a Windows update a few days ago, and the VPN app updated too. Before that, I could still print sometimes.
Technician avatar Technician
That “update timing” is important. This is common after updates, but we should rule out a few risks first.

Safe check: when the VPN disconnects (even briefly), does your internet stay broken until you reconnect the VPN or restart the computer? That’s a common sign of a kill switch holding the connection closed.
Customer
Yes! If the VPN drops, everything stops working until I reconnect it. Sometimes I have to restart the desktop to get internet back.
Technician avatar Technician
That’s a strong clue. A kill switch is designed to stop internet traffic if the VPN isn’t fully connected, to avoid leaks. It can feel like your internet is “broken,” but it’s a safety feature — and it can become overly strict after an update.

We’re not going to change it blindly. First, one more safe diagnostic question: when the VPN is ON and websites fail, does it fail on all browsers (Chrome/Edge/Firefox), or only one?
Customer
I tried Edge and Chrome. Same issue. Also, sometimes I can open a website by typing the full address, but clicking links doesn’t work.
Technician avatar Technician
That “sometimes works, sometimes not” can happen when DNS is inconsistent through the VPN, or when the VPN is switching servers/locations and the connection isn’t stable.

Trust moment: I don’t want you resetting your whole network as a first step. We can gather a few simple observations that point the right way.

When the VPN is ON, do you see the VPN status as “Connected” continuously, or does it flicker between connecting/connected?
Customer
It flickers sometimes. It says connecting, then connected, and sometimes reconnecting. I just want my internet and printer to work normally.
Technician avatar Technician
That makes sense — and you’re not alone. With a flickering VPN connection plus “everything stops when it drops,” the likely buckets are:
• A stricter kill switch behavior after an update, and/or
• DNS problems through the VPN, and/or
• VPN routing that blocks local network access (printers, shared folders) while connected.

The safest “what to do next” is to confirm: (1) whether the VPN is stable, (2) whether local network access is intentionally blocked by the VPN settings, and (3) whether DNS is the part failing when sites don’t load.

If you open the chat, tell me your Windows version (10 or 11), whether you’re on Wi-Fi or Ethernet, and what happens immediately after the VPN disconnects. I’ll guide the next safest check without risky resets.

Quick answer: safe checks when a VPN causes connection problems on a desktop

Accepted safe checks when a desktop VPN causes connection issues:
• Compare behavior with VPN ON vs OFF (helps confirm it’s VPN-related, not your router).
• Note whether local devices fail while VPN is on (printer, shared folders) — that often points to VPN routing rules, not a broken PC.
• Watch for VPN “connecting/reconnecting” loops; instability can cause random site failures and email timeouts.
• If internet stays blocked after the VPN drops, a kill switch may be involved — treat it as a feature, not a mystery failure.
• Avoid third-party “network fix” tools; gather simple clues first (browser messages, VPN status, Wi-Fi vs Ethernet) before any bigger changes.

Why a VPN can break browsing, email, or local printers (even when it says “Connected”)

A VPN changes where your desktop sends internet traffic. If the VPN connection is unstable, websites may load randomly and email may time out. Some VPNs also block your local network while connected, which can make printers and shared folders “disappear.” Another common issue is DNS: the VPN may use a different DNS service, and name lookups can fail even though the Wi-Fi itself is fine. If this started after an update, it may be a compatibility change between Windows and the VPN’s network adapter.

What to check first (safe): VPN stability, kill switch behavior, and Wi-Fi vs Ethernet

Start with simple, reversible checks. Confirm whether the problem only happens with the VPN on. Watch whether the VPN repeatedly reconnects, because that can look like “internet is down” even when your router is fine. Notice what happens right after the VPN disconnects; if everything stops until you reconnect, that often points to a kill switch. If possible, compare Wi-Fi and Ethernet, because that can separate a wireless problem from a VPN routing or DNS problem.

VPN messed up your desktop internet — calm, safe next checks

Start safe: confirm it’s VPN-related, then gather clues before changing settings.

If your desktop internet works normally until the VPN turns on, the goal is to figure out what the VPN is changing. The most common culprits are DNS, a kill switch that blocks traffic during disconnects, or local network access being routed away (printers and shared folders). You don’t need to do anything drastic first. A few calm observations — error messages, VPN reconnecting, and whether local devices vanish — can point to the right next step without guesswork.

Disclaimer: This information is AI-generated and intended for general guidance only. Avoid unknown “optimizer” tools and be cautious with advanced network resets. If this is a work VPN, your organization’s policies may limit what can be changed safely.

What to check next

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Many VPN connection issues come from a setting or update interaction. Safe checks can identify the cause before any major network changes.

FAQ

Why did my internet start failing right after I turned on a VPN?

A VPN changes routing and DNS, so browsing can fail even if your Wi-Fi is fine. If the VPN is reconnecting, sites may load randomly or time out. Some VPNs also block local network access while connected. Comparing VPN ON vs OFF is the safest first clue.

Did this happen after a Windows update or a VPN app update?

Yes, updates can change how the VPN network adapter behaves. A connection that used to be stable can start reconnecting or blocking traffic. This is common, but it’s usually diagnosable with safe checks. Note when it started and whether the VPN status flickers.

Is this a settings problem or is my network hardware failing?

If your internet works normally when the VPN is off, your router and hardware are less likely to be the main problem. VPN-related issues often look like DNS failures, blocked traffic, or local devices disappearing. Hardware problems usually affect all connections, not only VPN sessions. A Wi-Fi vs Ethernet comparison can help safely.

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

Yes. You can safely test VPN ON vs OFF, observe whether the VPN reconnects, and see if local devices disappear while it’s active. You can also note exact browser messages and what happens when the VPN disconnects. Avoid “network reset” unless you understand the impact. For work VPNs, changes may need to follow your organization’s rules.

Sources

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