'ERR_CONNECTION_TIMED_OUT when Angular project is served

I am trying to run an Angular project on localhost but when I tried to access to the url, it shows me the error. The same scenario appears when I run unit testing trying to connect with 60000ms twice and after that killed the process. I have reinstalled the angular version (10.2.3) but it shows me the same error.

Even when I type http://localhost:4200/ and http://localhost:4200/home but it shows me that:

I don't think it's a proxy or firewall issue, there is an error in Chrome browser?

thanks for your help.

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'ERR_CONNECTION_TIMED_OUT when Angular project is served

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