It also happens to me since the day before yesterday. Before that, for the past one year, things are going well. I did a little bit test trying to identify the problem: 1. Remote computer at office shows online but when being connected from home using laptop it turns out to be authentication rejected. 2. Brought my laptop to office today, under the same network, I can successfully connect to office desktop using exact same laptop. Haven't tried to restart the office desktop, though. Hopefully that helps.
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