Some clients can't reach my sites

General
1

I have few sites. Example bittires.com.ua. Some clients can’t reach any of them.
I has access to one of this device for few hour per day, i checked everything i can imagine.

  • on FireFox sites are working if in settings checked “DNS over HTTPS”, server - Cloudflare.
  • Chrome - not working
  • Edge - not working
  • If use some proxy - Chrome working. After proxy off Chrome stil working some time 1-10 hour.
  • [Checked] DNS resolve - right Ip address, same as on other devices
  • [Checked] TCP monitor, Chrome is trying connecting to right IP address
  • [Checked] nginx server log, no request reach server from this device when site not opening.

Please help.

2

For example, there is site shiny-diski.com.ua, looks like they use Cloudflare too, its work fine on test device, but my sites (bittires.com.ua) not working. What the difference between this sites ?

3

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