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eduroam gives you "network access" at the institution where you are. It does NOT give you "access to every JACOBS resource you need right now"" everywhere by itself. Some Jacobs services are protected and not accessible from "the Internet", e.g. the JACOBS network home drive. In those cases, you still need VPN Access on top of eduroam connect.
What "network access" means in detail is determined by the institution you are currently connected at! While Jacobs University is very liberal in offering Internet access, other institutions potentially aren't. "plain web" access via port 80 (aka HTTP) and mostly port 443 (HTTPS) is usually the minimum, but other ports like 8443 (HTTPS to tomcat, e.g. teamwork) or VPN connection might be blocked by the remote institution! If some services work for you, and others don't, please contact the IT staff at the institution you are currently at and figure out their institution's eduroam Internet access policy.
Configuration of eduroam requires network access already to download the CAT-Tool. On a notebook you can use cable-based LAN access to do so. On phones or tablets without LAN access you can temporarily use the JACOBS Wi-Fi network without logging in to it; if this fails, you need to use cellular data connection for setup.
Configure eduroam as early as possible and while still at Jacobs, else the Service Desk for Faculty and Staff can't help you.
The following pages give configuration information for several device types.