Verify error:num=21:unable to verify the first certificate Verify error:num=27:certificate not trusted Verify error:num=20:unable to get local issuer certificate What you are seeing there is the same as this: iMac:~ Mook$ openssl s_client -connect -tls1 -servername | openssl x509 -text -nooutĭepth=0 1.3.6.1.4.1.311.60.2.1.3 = GB, businessCategory = Private Organization, serialNumber = 106078, C = GB, postalCode = SN38 1NW, ST = Wiltshire, L = Swindon, street = 'Nationwide House, Pipers Way', O = Nationwide Building Society, OU = IT Infrastructure, CN = .uk