Troubleshooting QR Code Errors on Your Phone
Introduction
QR codes are a convenient way to access information quickly, but sometimes they can display errors when scanned. These issues are often related to network connectivity rather than the QR codes themselves. Below, we'll explore common QR code errors, why they occur, and how to troubleshoot them effectively.
Common Errors and Their Causes
1. Link Preview Errors
If scanning a QR code shows an error in the link preview, this might not be an issue with the QR code itself. Instead, it could be due to:
Network connection issues.
Restrictions imposed by your internet provider or local network.
2. “Address Isn’t Valid” Errors
When scanning a dynamic QR code over Wi-Fi, you may receive a message like, "Safari can’t open the page because the address isn’t valid." This usually happens because:
The router, firewall, or ISP filters are blocking access to the redirect domain used by dynamic QR codes (e.g., qr-codes.io).
3. “ERR Connection Failed” or Similar Messages
Errors such as “This site can’t be reached ... ERR_Connection_Failed” generally occur due to:
Local network issues.
DNS or ISP-related problems.
Network Connectivity Solutions When Scanning QR Codes
Follow these steps to resolve issues:
Switch to Mobile Data: - If the QR code doesn’t work over Wi-Fi, try turning off Wi-Fi on your phone and re-scan the code using mobile data. This bypasses potential local network restrictions or ISP filtering.
Check Router or Firewall Settings: - For dynamic QR codes, verify if the domain routing traffic (e.g., redirect URLs for QR codes) is being blocked. If you have access, update the router's configuration or contact your ISP for assistance.
Additional Troubleshooting Steps
Ensure your phone’s browser and QR code scanner app are updated.
Test scanning multiple QR codes to rule out issues with the specific code.
Contact customer support if the issue persists.
By following these steps, you can resolve many QR code issues and access the intended information seamlessly.
Related Topics
Understanding Dynamic vs. Static QR Codes
Router Configuration for Unblocking Redirect Domains
Common QR Code Scanning Tips and Tricks