Cannot login to RocketChat local server with any (non-web) client

Description:

Steps to reproduce:

Any attempt to login from client app:
Expected behavior?:

Expected behavior:

easy login, as it does from several other devices and browsers.

Actual behavior:

(a terminating '/' is added to Server URL entry - odd?) "No valid server found at the URL."

Server Setup Information:

• Version of Rocket.Chat Server: 1.3.2

OS Type: linux
platform/arch: arm
OS Release: 5.4.72-v7+
Node version: v8.11.4
Mongo Version: 3.2.15
Mongo Storage Engine: mmapv1

Client Setup Information

• Desktop App or Browser Version: App version 3.0.3
• Operating System: Either MacOS 10.16 or Ubuntu 20.1 - same behavior

Additional context

Easily reproduced: Any attempt to log in from any RocketShare client (Electron?)
This is a local test server only - for the time being - so it has not been https-secured.
server pings - not a network issue
in fact, connection from browser to same server : AOK.
significant?: Have just updated Ubuntu to 20.10 - from 20.04
rocketchat-desktop has been removed and re-installed...

Relevant logs:

Server logs nothing at point of attempted login (from the Rocket client)

Relevant errors and other log output: logs show no evidence of login attempt...
Version of Rocket.Chat Server: 1.3.2
Server Setup Information: Fresh arm4f install on Raspberry PI (same behavior seen against Ubuntu install)

Our server address is http://192.168.42.78:3000 (local network test only, for the moment)

Reproduce the login attempt in Rocket.Chat App 3.0.3 against the local HTTP server at http://192.168.42.78:3000, comparing it with browser access. Start by checking the desktop client’s server URL handling and login request, then verify that the client accepts the server and that the server records a login attempt without adding an invalid trailing slash.