In a Brave Browser New Window go to the On exit tab at: brave://settings/clearBrowserData ← There, DISABLE both: Cookies and other site data and Site and Shields Settings.
Purpose of the following steps, is to try and clear the path for JavaScript data transfers between your Local Area Network (“LAN”) server and Brave Browser. Using 192.168.0.23 as an example of the IP address for your LAN server . . .
In a Brave Browser New Window, go to the Brave Browser (“BB”) settings page: brave://settings/content/siteDetails?site=https%3A%2F%2F192.168.0.23
At the BB settings page, scroll down to, and set, JavaScript to Allow.
(Note that the long, leading portion of that address, on up to the beginning of the IP address, is: brave://settings/content/siteDetails?site=https%3A%2F%2F ← a fixture, if you will, to which you can add other IP addresses, hostnames, and domain names. Thus:
Repeat those steps for concave-eraser.local ← ie, use BB settings page: brave://settings/content/siteDetails?site=https%3A%2F%2Fconcave-eraser.local
Next, in a Brave Browser New Window, go to BB settings page: brave://settings/content/javascript and scroll down that page to Allowed to use javascript There, enter [*.]192.168.0.23 as the site . . . but do not Enable Current Private session only.
Repeat those steps for entering [*.]concave-eraser.local
Exit / Quit BB. Restart the computer.
When the computer is fully restarted, run BB and test the browser’s connection to the LAN server; testing each of:
Also test via a Brave Browser New Window → brave://settings/security and, if User secure DNS is ENABLED, then set Select DNS provider to OS default (when available). And, test User secure DNS → DISABLED.