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21 changes: 11 additions & 10 deletions _articles/faq/chromium-142-local-network-access-issue.md
Original file line number Diff line number Diff line change
Expand Up @@ -15,11 +15,11 @@ last_modified: 2025-11-04 17:21:42 +0800
> [!IMPORTANT]
> This is a newly developing issue, and as such the information in this article may change over time.

## Error message - Access to fetch at `https://127.0.0.1:18623` or `http://127.0.0.1:18622` has been blocked by CORS policy: Permission was denied for this request to access the unknown address space.
## Error message - CORS Errors caused by local network access permissions when using Chromium 142 and later

### Symptom

When using Chromium-based browsers version 142 or later (released on October 28th, 2025), including Chrome, Edge, Brave, and Opera, the Dynamsoft Web TWAIN Service may fail to function properly:
When using **Chromium-based browsers version 142 or later** (released on October 28th, 2025), including Chrome, Edge, Brave, and Opera, the Dynamsoft Web TWAIN Service may fail to function properly:

- Phenomenon 1: the browser prompts users to download the service installer even though it is already installed.

Expand All @@ -41,22 +41,27 @@ This affects the Dynamic Web TWAIN Service which relies on local services for co

### Resolution

***Step 1: (For All End Users)***
***1. To Manually Correct This in Chrome***

- Navigate to your Dynamic Web TWAIN web interface

- Click the lock icon (or settings icon) next to your site URL in the browser’s address bar.
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Copilot AI Nov 5, 2025

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Missing step: After clicking the lock icon, users need to select 'Site Settings' or 'Permissions' from the dropdown menu before they can access the Local Network Access setting. Add an intermediate step to guide users through the complete navigation path.

Suggested change
- Click the lock icon (or settings icon) next to your site URL in the browser’s address bar.
- Click the lock icon (or settings icon) next to your site URL in the browser’s address bar.
- In the dropdown menu, select **Site Settings** (or **Permissions**).

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Not really necessary here. The local network access toggle is visible without going in to the detailed Site Settings.


- Ensure that **Local Network Access** is enabled.

![local-network.png](/assets/imgs/local-network.png)

> [!NOTE]
> If you're unable to restore functionality after enabling 'Local Network Access,' please contact [Dynamsoft](https://www.dynamsoft.com/contact/).

***Step 2: (For Developers Only)***
***2. (For Administrators) To Apply This Setting Across an Enterprise***

Enterprise administrators can deploy a Chrome and/or Edge policy to set the "Local Network Access" setting to "Allow" for your website.

**Option 1:**
Please refer to:
* [Chrome Enterprise Policy List & Management | Documentation](https://chromeenterprise.google/policies/#LocalNetworkAccessAllowedForUrls)
* [Microsoft Edge Browser Policy Documentation](https://learn.microsoft.com/en-us/deployedge/microsoft-edge-browser-policies/localnetworkaccessallowedforurls)
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[nitpick] The URL fragment 'localnetworkaccessallowedforurls' should be lowercase according to Microsoft's URL standards, but the mixed case 'LocalNetworkAccessAllowedForUrls' might be correct. Consider verifying this URL is accessible before publishing.

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***3. (For Developers) To Manually Check the Permission on Local Network Access***

You can check the permission programmatically:

Expand All @@ -74,10 +79,6 @@ If the permission is not granted, prompt users to manually enable it (Chrome set
<iframe src="..." allow="local-network-access *"></iframe>
```

**Option 2: (For Enterprise Users)**

Enterprise administrators can allow specified URLs to access local resources through Chrome’s Enterprise Policy configuration.
Refer to: [Chrome Enterprise Policy List & Management | Documentation](https://chromeenterprise.google/policies/#LocalNetworkAccessAllowedForUrls)

### Planning

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2 changes: 1 addition & 1 deletion _articles/faq/index.md
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Expand Up @@ -206,7 +206,7 @@ description: Dynamic Web TWAIN SDK Documentation FAQ
30. [How to debug on Dynamic Web TWAIN online demo?](/_articles/faq/debug-on-online-demo.md)
31. [Dynamic Web TWAIN prompts the .deb installer for Windows](/_articles/faq/incorrect-installer-for-windowsARM64.md)
32. [Why am I unable to load the TIFF file into Dynamic Web TWAIN?](/_articles/faq/unable-to-load-4-bit-tiff.md)
33. [Error message - Permission was denied for this request to access the unknown address space](/_articles/faq/chromium-142-local-network-access-issue.md)
33. [Error message - CORS Errors caused by local network access permissions when using Chromium 142 and later](/_articles/faq/chromium-142-local-network-access-issue.md)

## Licensing and Purchase

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