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Generate Multi Domain SSL Certificate by useing cert bot tool from Let's Encrypt.

 We are using cert bot tool to generate / create multi domain certificate from Let's Encrypt CA. we are using following command  create CSR config file to generate CSR: Example of csr file is: default_bits            = 2048  # RSA key size encrypt_key             = no  # Protect private key default_md              = sha256  # MD to use utf8                    = yes  # Input is UTF-8 string_mask             = utf8only  # Emit UTF-8 strings prompt                  = no  # Prompt for DN distinguished_name      = server_dn  # DN template req_extensions          = server_reqext  # Desired extensions [ server_dn ] countryName             = CountryName # ISO 3166 stateOrProvinceName     = StateName localityName            = CityName organizationName        = OrgName organizationalUnitName  = UnitName commonName              = domainname.tld  # Should match a SAN under alt_names [ server_reqext ] basicConstraints        = CA:FALSE keyUsage                = critical,digitalSignature,keyEnci
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