When I try to connect my mBot via openroberta-connector I obtain : "There is a problem with your Internet connection"

[TechnologieGerbault]

When I try to connect my mBot at school I obtain this message and it works at home.

Do I have to ask my administrator to open some port(s) or to allow openroberta-connector an acces to internet ?

Thanks for the answer.

[googligerpete]

I'm experiencing this exact behavior (with arduino uno), regardless of whether I'm working on Windows or macOS. Here's a log from a local built on macOS (intel i5, macOS Monterey 12.7.6, java jdk-25_macos-x64_bin.tar.gz, openroberta-connector tag v1.6.9 or v1.7.0):

Pressing "connect" button, then

2025-12-25 20:26:57,039 [AWT-EventQueue-0] INFO d.f.i.roberta.ui.main.MainController actionPerformed - User performed action connect
2025-12-25 20:26:57,042 [AWT-EventQueue-0] INFO d.f.i.r.connection.AbstractConnector resetToDefaultServerAddress - Now using default address lab.open-roberta.org:443
2025-12-25 20:26:57,047 [main] INFO d.f.i.roberta.ui.main.MainController setState - Setting state to WAIT_FOR_SERVER
2025-12-25 20:26:57,353 [main] ERROR d.f.i.r.c.w.arduino.ArduinoConnector runLoopBody - CONNECT Server returned HTTP response code: 400 for URL: http://lab.open-roberta.org:443/rest/pushcmd
2025-12-25 20:26:57,354 [main] INFO d.f.i.roberta.ui.main.MainController setState - Setting state to ERROR_HTTP
2025-12-25 20:27:00,127 [main] INFO d.f.i.roberta.ui.main.MainController setState - Setting state to DISCOVER
2025-12-25 20:27:00,133 [main] INFO d.f.i.roberta.ui.main.MainController setState - Setting state to WAIT_FOR_CONNECT_BUTTON_PRESS

I was wondering why http://lab.open-roberta.org:443/rest/pushcmd is used (http AND port 443), so I hardcoded the url to be with https in the source code.
Voilà, then the log gives me details of an ioException:

2025-12-25 21:32:06,285 [main] ERROR d.f.i.r.c.w.arduino.ArduinoConnector runLoopBody - CONNECT (certificate_unknown) PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target

[googligerpete]

.... so the solution, at least for me: add the lab.open-roberta.org's ssl certificate to java's keystore, see
https://nishabe.medium.com/how-to-add-ssl-cert-to-the-java-trust-store-bbd1a52940c2

-> working.