Linux Mint wired networking strangely restricted by a captive portal

First, I apologize in advance: I may not be know the correct terminology so I will explain the problem in detail. I have two PCs running Linux Mint and connected to the inteet on a wired network. This network is usually restricted by a "captive portal". Box A connects to the inteet freely without the captive portal, but Box B asks to login via a browser (captive portal).

As one of the employees, I shouldn't be restricted by the captive portal so I complained to the IT guy. There is some Cisco software that employees need to install so that they won't be restricted but it only runs for Windows and Mac, so I am told "You have to install Windows or use a Mac" and that is frustrating cos I know it can connect directly - at least the other box does so effortlessly. When I said so, the IT guy said I need to figure it out in that case since my use-case is an edge case, and nobody else is using Linux. I really need to use Linux, and I don't want to have to install Windows.

What I have tried: - I tested the network using Windows and a Mac, and they needed the captive portal to access the inteet. Linux Box A simply does not. - I used the exact same cable in use by box A, for box B. Still no difference. - I noted the gateway and DNS on box A, and tried to put those details on box B. I realized they have the same DNS, but the gateway and subnet mask are different. After changing the gateway, still no luck. I also edited /etc/network/interfaces and added the gateway from box A, still no dice. I am probably missing something, but I don't know what it is.

Please any suggestions on what to do, are welcome.

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