In this case fixing the issue required knowledge of how certs work in order to guess that there is a date issue. That&#x27;s probably pretty rare at fix-your-computer shops.<p>It&#x27;s pure luck that I&#x27;d seen this type of issue before because I&#x27;m one of those mere civilians: my Windows machine at work loses BIOS settings on power down. I&#x27;ve seen that until the date is restored, DropBox and several other things don&#x27;t work.