It sounds too simple to be real, but a wrong PC clock is a documented connection killer: encrypted apps check certificates against the date, and a clock that is days out makes every CapCut server look like a fake. This page fixes the clock properly - automatic time, a manual sync, and the drifting-clock causes underneath.
Before you reinstall anything, glance at the bottom-right corner of your screen. If the date or time is wrong, you may have found your whole problem. CapCut cannot explain "your clock makes my servers look fraudulent" - it can only say no internet. Two minutes in the time settings can end a fault that survives reinstalls, because a reinstall never touches the clock.
CapCut talks to its servers over encrypted connections, and encryption starts with a certificate - a digital ID card with a validity period printed on it. Windows checks that card against your PC clock. If the clock is set days or months wrong, every valid certificate looks expired or not yet valid, the connection is refused, and CapCut reports the only error it has for a failed connection: no internet. Your browser often survives because it warns instead of silently failing - the app does not.
If Sync now errors, the Windows Time service may be stopped: open services.msc, find Windows Time, set it to Automatic and start it, then sync again. A clock that loses hours whenever the PC is off points at the small CMOS battery on the motherboard - a cheap part, but on a laptop it may need a service visit. Dual-boot PCs have their own version of this fight: Windows and Linux disagree about the hardware clock, so the time breaks after every switch - fix it on one side and it stays fixed.
A wrong region setting can leave the time zone technically right but the services confused, and some CapCut features vary by region. In Settings, Time and language, Language and region, confirm the country matches where you actually are. Change nothing else there - this page is about an honest clock, and faking a region to chase features is a different topic with its own risks.
See the complete CapCut fix in the video - the clock check is one of the steps shown on the real PC.
Watch Full VideoCheck the date and year, not just the hours - a correct-looking 4 30 PM with the wrong month still breaks certificates. If date, time and zone are all right and sync succeeds, move on to the firewall, proxy and DNS pages in this set.
The motherboard keeps time while the PC is off using a small coin battery (CMOS battery). When it dies, the clock resets or drifts after every shutdown. Replacing it is inexpensive on a desktop; on many laptops it needs a technician.
You can, and it works as a quick test. But automatic time with Sync now is the durable fix - manual time drifts again within weeks, and the certificate errors return with it.