Certificate error while pushing no… | Apple Developer Forums
We did a temporary fix by setting lower SSL security level.

In particular, the openSSL configuration file /etc/ssl/openssl.cnf shall be modified in the following way.
At the beginning, add openssl_conf = default_conf
At the end, add
Code Block 
[ default_conf ]
ssl_conf = ssl_sect
system_default = ssl_default_sect
MinProtocol = TLSv1.2
CipherString = DEFAULT:@SECLEVEL=0

After this modification, the certificate is recognized without security errors.

Referenced from: itectec.com/ubuntu/ubuntu-certificate-error-after-upgrade-to-20-04


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