Incomplete certificate chain

There are 3 methods to test the incomplete certificate chain:

The error is:
Chain issues Incomplete

2) curl -v -o /dev/null
The error is:
* Peer’s Certificate issuer is not recognized.

3) openssl s_client -showcerts -verify 10 -connect
The error is:
Verify return code: 21 (unable to verify the first certificate)


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