The new SecuTix kit containing Firefox uses a new way to communicate with the peripheral hardware like printers, cash drawers and payment terminals. The new app called Device Manager installed at the same time as Firefox is handling the communication with box office peripherals and replaces the applets that will no longer be used in the future.

The install program deploys a portable version of Firefox ESR and Java. The installed version contains some custom parameters to avoid external problems like an unreachable certificate provider, …

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It's possible that your antivirus/firewall (like Sophos) is blocking the communication between the browser and the Device Manager.

The communication is done from the browser to the Device Manager --> 127.0.0.1, port 8555 and you can find a second port (between 15700 and 15799) on the first line from the following URL (please replace [INST_CODE] by your institution code): https://[INST_CODE].pos.secutix.com/tnapplets/applet-properties/devicedrivers-agent.properties 

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Here you can find more information about the way the SecuTix kit and the Device Manager operate: Comment fonctionne la nouvelle communication avec le matériel sur la nouvelle version de SecuTix?

Here is the guide to install the browser and the Device Manager separatly: Comment installer Firefox ? (installations alternatives) (V3; dès avril chez tous les clients)