The browser does not trust the certificate's issuance chain.
Appears on private certificate sites or TLS inspection networks.
Distinguish whether it is a public site or an internal company site.
If it is checked and resolved from above, you do not need to proceed to the next step.
Appears on private certificate sites or TLS inspection networks.
Difficulty Easy · Estimated time 5 minutes
Check points: Record the error code, when it occurred, and any recent changes.
The browser does not trust the certificate's issuance chain.
Difficulty Moderate · Estimated time 10~30 minutes
Check points: Make sure you are connected with a normal, trustworthy certificate chain.
When troubleshooting a computer that suddenly fails to connect to the Internet, it is important to rule out the causes one at a time. Based on the “No Internet” symptom, check the router/modem or ISP problem and the network adapter/IP/DNS settings, then proceed to the next step. Compare with other devices and wired connections to narrow down where the problem occurs: PC, router, or ISP.
Among Internet problems, the “Wi-Fi connected but no Internet” symptom may be related to the router’s Internet line or DHCP/DNS problems. Check the wireless adapter status, saved profiles, router/signal quality, and driver in order.
Content review date: 2026-10-07