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Forum Discussion
LINE App Cannot Send or Receive Messages When Connected to RBR750 WiFi
Hello All,
Since two days ago, mobile devices (iPhone 16 and older Android) connected to our RBR750 WiFi cannot send or receive messages on LINE, and LINE VOOM videos fail to play. Switching to mobile data (4G/5G) resolves the issue immediately.
A Mac mini on the same WiFi also cannot log in to LINE Desktop — the one-time QR code fails to generate. Other apps (Instagram, Facebook, Email, Telegram, etc.) work fine.
All router security/monitoring features, including Netgear Armor, Traffic Meter, and IPv6, have been disabled, but the issue persists. Firmware is V7.2.7.15_5.1.16 (released July 7, 2025). The RBR750 rebooted one day before the issue started, but it’s unclear if this caused it.
Switching to an older WiFi 5 router resolves the problem — LINE works normally.
Any suggestions on how to fix this issue?
4 Replies
Something to get help from the app Mfr about regarding there app.
What is the Mfr and model# of the Internet Service Providers modem/ONT the NG router is connected too?
Try disabling the following and see:
Armor, Smart Parental Controls or Circle, IPv6, Traffic Meter.Try disabling AX mode on the RBR. Under Basic/Wireless check box.
Hi,
Thank you for your reply.
🔹 Information from LINE App Support
According to the official LINE App support page, for connection-related issues, it is recommended to switch between different network types — such as WiFi and mobile data (4G/5G) — to help identify the cause.
If the app functions normally after switching, it usually indicates that the problem is related to the network equipment, and users are advised to contact their network device provider for further assistance.🔹 Network Device Information
The upstream device connected to the RBR750 is a Nokia G-0425G-P GPON HGW, which was provided by the ISP during the internet installation.
🔹 Tested Actions
The following features have been disabled for testing, but the issue persists:
Netgear Armor
Smart Parental Controls / Circle
IPv6
Traffic Meter
Additionally, AX mode was also disabled for testing, but this did not resolve the problem either.
🔹 Additional Observations
This network setup has been running normally for over two years without any issues until this problem suddenly appeared two days ago.
All other apps requiring internet access (e.g., Instagram, Facebook, Email, Telegram) continue to work perfectly — only LINE is affected.Since LINE is a very popular and widely used app in our region, and Netgear products are known for their high-end performance and reliability, this situation is quite puzzling.
🔹 Request for Further Assistance
If there are any additional suggestions or troubleshooting steps that I can try, please kindly let me know.
Thank you very much for your support.
Are you in Japan?
Hi,
Thank you for your reply.I’m located in Taiwan, which is geographically close to Japan,
but I don’t think this issue is related to any license problem.The main issue is that LINE messages cannot be sent or received properly, which is the app’s core and essential function.
Testing with LINE VOOM is just another way to verify whether the device can successfully connect to the LINE servers, not only for text communication but also for video and media transmission.So far, I haven’t seen any error messages related to licensing.
It behaves more like a situation where the app cannot connect to the internet, as no content or interface elements are loaded.Thank you again for the information you provided.
If there are any other possible solutions or settings to try, please feel free to share them — I’m happy to test further.
