Verify network traffic yourself
Follow these steps to confirm that LINE Data Master only connects to the expected servers.
Method 1: Windows Resource Monitor
Use the built-in Windows tool to inspect the app's network connections.
Open Resource Monitor
Press Win+R, type resmon, and press Enter.
Go to the Network tab
Click the "Network" tab at the top.
Find LINE Data Master
In the "Network Activity" section, look for the process named "LINE Data Master".
* The MCP Server port is randomly assigned on each launch. The actual number will differ from the illustration. You can check it in the app settings page.
Verify the connections
You should only see connections to these destinations:
- ✓
linebkp.com— Subscription verification - ✓
*.line-apps.com— LINE media download - ✓
127.0.0.1— MCP Server (localhost only)
If you see connections to any other server, please report to us immediately.
Method 2: PowerShell command
Check all connections with a single command.
Open PowerShell
Search for "PowerShell" in the Start menu and open it.
Run the command and check the output
Copy and paste the following command into PowerShell:
PS C:\> Get-NetTCPConnection -OwningProcess (Get-Process "LINE Data Master" -ErrorAction SilentlyContinue).Id 2>$null | Select-Object RemoteAddress,RemotePort,State | Format-TableExpected output example:
RemoteAddress RemotePort State ------------- ---------- -----
104.18.12.33 443 Established
↑ linebkp.com
203.104.128.34 443 Established
↑ obs.line-apps.com
127.0.0.1 * Established
↑ MCP Server (localhost, *port is randomly assigned)
Method 3: Inspect Actual Data with Fiddler
The first two methods only show connection targets. This method lets you see the actual data being sent, confirming only email and token are transmitted — no LINE data.
Download and install Fiddler Classic (free)
Fiddler is an HTTP debugging tool that intercepts and displays all network requests from applications.
Enable HTTPS decryption
After opening Fiddler, enable HTTPS decryption to see the content of encrypted requests.
Settings path:
Tools → Options → HTTPS → Decrypt HTTPS traffic ✓Open LINE Data Master and inspect intercepted requests
In Fiddler's left panel, find requests to linebkp.com. Click one and check the Request Body on the right:
Verify the transmitted data
The Request Body you see should only contain:
✓ Only email (your login account) and token (for subscription verification)
✓ No message content, contacts, images, or file data
✓ No LINE chat, group, or personal information
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