How to fix Cooler Master Portal? in MasterMouse S Posted June 12, 2019 Found this thread because I was having same issue with the Portal software and the new SK621 wireless keyboard. Turns out users have to connect the SK621 via USB, and toggle the wireless switch on the SK621 to off. It's pretty ridiculous that the Portal software says there's a network error as a result of this. But then the Portal software is pretty poorly designed. Of course, that doesn't excuse Cooler Master for 'in general' not providing clear instructions for how to install and use the hardware/software they sell to customers. The keyboard just comes with a cheat sheet for the FN key combos, some warranty info, and some basic instruction for connecting to Bluetooth. On closer inspection, the box says there's a Quickstart guide with battery info, but I didn't get one of those... maybe there was actually supposed to be a detailed guide?