What is VPN-TUN-DROP?
VPN-TUN-DROP is a medium-severity network adapter problem. The encrypted VPN connection was unexpectedly terminated by the firewall. Common triggers are ISP Provider Error, corrupt network card driver, stuck Router and IP address conflict. Follow the steps below to fix it.
Common Causes
- ISP Provider Error
- Corrupt network card driver
- Stuck Router
- IP address conflict
Step-by-Step Fix Guide
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1
Restart the router (turn off for 1 minute)
Restart the router (turn off for 1 minute) resolves the majority of VPN-TUN-DROP cases on its own, making it the logical starting point.
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2
Reset complete network settings in Windows
If the problem isn't fully resolved yet, the remaining steps rule out the less frequent network instability triggers.
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3
Change the DNS servers to 8.8.8.8
"Change the DNS servers to 8.8.8.8" is the next step worth ruling out for VPN-TUN-DROP.
Commands & Diagnostics
ipconfig /release
ipconfig /renew
ipconfig /flushdns
netsh winsock reset
Frequently Asked Questions
ISP Provider Error accounts for the majority of VPN-TUN-DROP reports; corrupt network card driver, stuck Router and IP address conflict come up less often but are documented.
Most VPN-TUN-DROP reports resolve after "Restart the router (turn off for 1 minute)". The rest of the guide above is there for the cases that don't.
VPN-TUN-DROP is a medium-severity issue. It can affect system stability, but the fix steps above typically resolve it without lasting damage.
You shouldn't need to. Work through the guide above first — a reinstall is only worth considering if none of those steps help.
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