JSPrintManager - Browsers "Local Network Access" (LNA) / Apps and Devices Popup

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Published 04/15/2026 Updated 04/15/2026 Author Neodynamic

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Overview

The implementation of Local Network Access (LNA) in Chrome 142+ (followed by other browser brands) changes how web applications interact with locally installed applications like JSPrintManager.

Chrome's Local Network Access (LNA) is a browser security change that prevents websites/webapps from silently making requests to devices on your local network without an explicit user permission.

How to proceed under this scenario?

• For End Users
• For Corporate Environments

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For End Users

When a user opens a website that uses JSPrintManager script, the latest versions of Chrome (and other browsers) will open a prompt (similar to the below screenshot) that the user must click Allow to get it working.

If the above popup is not displayed, then it's likely it is blocked. If that's the case, then open the following context menu from the browser and then click Reset permission and then click Allow on the previous popup.

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For Corporate Environments

Administrators can bypass these prompts using the LocalNetworkAccessAllowedForUrls (or similar) administrative policy to whitelist any specific domains.

• Enterprise policy for Chrome: https://chromeenterprise.google/intl/en_ca/policies/local-network-access-allowed-for-urls/
• Enterprise policy for Firefox: https://mozilla.github.io/policy-templates/#localnetworkaccess (WIP, see https://github.com/mozilla/policy-templates/issues/1259)
• Safari: Please get in touch with your MDM provider.

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More information

More related information about LNA restrictions imposed by browsers:

• Since Chrome 142, Chrome no longer allows "public" websites to silently connect to "private" addresses: https://developer.chrome.com/blog/local-network-access
• Firefox features a similar restriction, but with a checkbox to "remember this decision" https://support.mozilla.org/en-US/kb/control-personal-device-local-network-permissions-firefox
• Apple already imposes Local Network restrictions at the OS-level: https://support.apple.com/guide/mac-help/control-access-to-your-local-network-on-mac-mchla4f49138/mac