topic Re: Bug Report: VPN Fusion Device Assignment stuck loading – JavaScript ReferenceError on ZenWiFi AX in Networking

Bug Report: VPN Fusion Device Assignment stuck loading – JavaScript ReferenceError on ZenWiFi AX XT8

esortho — Sat, 07 Nov 2026 10:37:38 GMT

Dear ASUS Support Team,

I would like to report a reproducible bug in the VPN Fusion web interface on the ASUS ZenWiFi AX XT8.

The issue prevents users from assigning devices to VPN connections, despite the VPN tunnel itself functioning correctly.

System Information

Router: ASUS ZenWiFi AX XT8
Configuration: Two XT8 units in AiMesh configuration
Operation Mode: Wireless Router
Firmware: 3.0.0.4.388_24911
VPN Type: WireGuard (VPN Fusion client)
Browser: Google Chrome
Router Web Interface: HTTPS

Problem Description

When opening VPN Fusion → Device Assignment, the device selection dialog remains stuck in a loading state indefinitely.

No devices are displayed, even though all connected clients are correctly listed under Network Map → Clients.

The WireGuard VPN connection itself is established successfully.

Steps to Reproduce

Log in to the ASUS router web interface.
Navigate to VPN → VPN Fusion.
Configure and activate a WireGuard VPN client.
Open Device Assignment to select which clients should use the VPN connection.
Observe that the device list never loads.

Expected behavior:

The Device Assignment dialog should display the available network clients and allow the user to assign them to the VPN connection.

Actual behavior:

The dialog remains stuck loading, and no clients are displayed.

JavaScript Error

Using Chrome Developer Tools, I identified the following error:

Uncaught ReferenceError:
getVendorIconClassName is not defined

at Get_Component_Client_List_Item (vpnc.html:1231:27)
at String.<anonymous> (vpnc.html:1324:31)
at ce.each (jquery.js:2:3129)
at Get_Component_Setting_Client_Policy (vpnc.html:1316:3)
at show_popup_second (vpnc.html:239:51)
at HTMLDivElement.<anonymous> (vpnc.html:1188:1)

The error occurs while VPN Fusion attempts to construct the device assignment list.

Additional console errors observed:

GET /VPN/countries.json
404 (Not Found)

GET /VPN/vpnc.css
net::ERR_TOO_MANY_RETRIES

These additional resource-loading errors may or may not be related.

Confirmed Workaround

I was able to restore the Device Assignment functionality by manually defining the missing JavaScript function in the correct execution context using Chrome Developer Tools.

The following code was executed in the VPN Fusion page’s JavaScript context:

window.getVendorIconClassName = function() {
    return "";
};

Result:

The Device Assignment list loaded successfully.
All available clients became visible.
Devices could be assigned to the WireGuard VPN connection.
The configuration was successfully saved.

This confirms that the missing JavaScript function is responsible for blocking the device list rendering.

The workaround is temporary and must be reapplied when the page is reloaded.

Suspected Root Cause

The VPN Fusion interface calls getVendorIconClassName() from vpnc.html, but the function is not available in the page’s JavaScript execution context.

This may indicate:

A missing JavaScript dependency.
An incorrect script-loading sequence.
A missing function definition in the current firmware.
A regression introduced in firmware 3.0.0.4.388_24911.

Since manually defining the function resolves the issue, the problem appears to be isolated to the VPN Fusion web interface rather than the underlying VPN functionality.

Requested Action

Please investigate and correct the missing getVendorIconClassName() function in the VPN Fusion interface.

Ideally, the fix should ensure that the client assignment list loads correctly without requiring manual JavaScript intervention.

I can provide screenshots of the Chrome Developer Tools console showing the error and the successful workaround.

Please confirm whether this is a known issue and whether a firmware fix is planned.

Best regards

Re: Bug Report: VPN Fusion Device Assignment stuck loading – JavaScript ReferenceError on ZenWiFi AX

Bvgpl — Sat, 07 Nov 2026 20:46:22 GMT

firmware 3.0.0.4.388_34157 (model like the TUF-AX4200), the VPN Fusion interface fails to load the device selection dialog, preventing the assignment of clients to VPN profiles.

Re: Bug Report: VPN Fusion Device Assignment stuck loading – JavaScript ReferenceError on ZenWiFi AX

jzchen — Sun, 08 Nov 2026 21:02:39 GMT

Please provide a Feedback log to ASUS for their technicians to repair this malfunction in a future firmware update.

-> Administration -> Feedback (tab)

Re: Bug Report: VPN Fusion Device Assignment stuck loading – JavaScript ReferenceError on ZenWiFi AX

Aureliannn_ASUS — Mon, 09 Nov 2026 05:59:10 GMT

Hi @esortho @Bvgpl ,

Thank you for sharing your detailed findings regarding the VPN Fusion Device Assignment issue on your ZenWiFi AX XT8.

We understand that the device list remains stuck on loading when using WireGuard VPN, even though the VPN connection itself works normally. We also appreciate your findings regarding the JavaScript error (getVendorIconClassName is not defined).

To help our technical team investigate further, could you please submit a Feedback Log through the router's Web GUI while the issue is occurring?

After submitting the feedback, please share the following information with us via private message:

Router MAC Address
Feedback Submission Date and Time (including time zone)
Email Address Used for the Feedback Submission
Product Serial Number (S/N)
Screenshots of the Device Assignment loading issue and the JavaScript error in Chrome Developer Tools

Once we receive the information, we'll forward it to our technical team along with your findings for further investigation.

We understand your concern about whether this is a known issue and if it can be addressed in a future firmware update. However, further investigation is needed before we can confirm the cause or any potential fix.

Thank you for your patience and assistance!

Re: Bug Report: VPN Fusion Device Assignment stuck loading – JavaScript ReferenceError on ZenWiFi AX

grahamwharton — Mon, 09 Nov 2026 14:19:24 GMT

Seeing the exact same problem on RT-AX59U 3.0.0.4.388.34157 when trying to assign devices to VPN fusion profile.

I can also confirm that downgrading back to 3.0.0.4.388_34098 resolves the issue (albeit getting rid of the NordVPN/Surfshark VPN Fusion additions). The problem introduced in version 3.0.0.4.388_34156.