Strapi returned 401 error for my app in server, but in localhost all good

System Information
  • Strapi Version: 2.5.4
  • Operating System: Ubuntu
  • Database: Postgres
  • Node Version: 14.16.0
  • NPM Version: 6.14.11

why this can happen?
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I also uploaded here Secure Cloud Storage & File Sharing Service | FEX.NET

I don’t know what happened, but it started working.
I also had a similar problem, in another project, there on some endpoints also returned 401 errors, but I did not understood the cause of the problem because the customer decided to stop the project.
Maybe you have some idea why this might happen?