Hi Oleg, Thank you for your clarification. If I understood correctly the Common Name attribute is deprecated but still in use. The DefaultHostnameVerifier is using it as a fallback if there is no subjectAltName entry.
> What I would like to see is whether or not the subjectAltName attribute > in the certificate has been declared as email address. If the > attribute type declares the entry as DNS or IP, then the certificate is > clearly invalid. Here an example certificate which reflects the certificate I had issues with. It just contains one email address in subjectAltName, neither a DNS nor an IP entry. -----BEGIN CERTIFICATE----- MIIDpTCCAo2gAwIBAgIJANqkMEtlkelbMA0GCSqGSIb3DQEBCwUAMHAxCzAJBgNV BAYTAlVTMQswCQYDVQQIDAJWQTERMA8GA1UEBwwIU29tZUNpdHkxEjAQBgNVBAoM CU15Q29tcGFueTETMBEGA1UECwwKTXlEaXZpc2lvbjEYMBYGA1UEAwwPd3d3LmNv bXBhbnkuY29tMB4XDTE4MDIxNTA3MjkzMFoXDTIwMDIxNTA3MjkzMFowcDELMAkG A1UEBhMCVVMxCzAJBgNVBAgMAlZBMREwDwYDVQQHDAhTb21lQ2l0eTESMBAGA1UE CgwJTXlDb21wYW55MRMwEQYDVQQLDApNeURpdmlzaW9uMRgwFgYDVQQDDA93d3cu Y29tcGFueS5jb20wggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQC4v6Oq Ua0goRVn1cmT7MOpJhXFm3A70bTpvJIRpEjtGIz99hb34/9r5AYyf1VhKyWmBq24 XNcOJ59XOlyjjbm2Tl811ufTOdcNbPadoVBmMt4039OSUFpVb4wAw2XPWLTCG2h1 HNj9GuFHmwcDsg5EiIRrhDGQm2LLLAGoe5PdReoMZCeeWzNWvKTCV14pyRzwQhJL F1OmzLYzovbPfB8LZVhQgDbLsh034FScivf2oKDB+NEzAEagNpnrFR0MFLWGYsu1 nWD5RiZi78HFGiibmhH7QrEPfGlo2eofuUga6naoBUROqkmMCIL8n1HZ/Ur0oGny vQCj1AyrfOhuVC53AgMBAAGjQjBAMAsGA1UdDwQEAwIEMDATBgNVHSUEDDAKBggr BgEFBQcDATAcBgNVHREEFTATgRFlbWFpbEBleGFtcGxlLmNvbTANBgkqhkiG9w0B AQsFAAOCAQEAZ0IsqRrsEmJ6Fa9Yo6PQtrKJrejN2TTDddVgyLQdokzWh/25JFad NCMYPH5KjTUyKf96hJDlDayjbKk1PMMhSZMU5OG9NOuGMH/dQttruG1ojse7KIKg yHDQrfq5Exxgfa7CMHRKAoTCY7JZhSLyVbTMVhmGfuUDad/RA86ZisXycp0ZmS97 qDkAmzFL0sL0ZUWNNUh4ZUWvCUZwiuN08z70NjGqXMTDCf68p3SYxbII0xTfScgf aQ/A/hD7IbGGTexeoTwpEj01DNvefbQV6//neo32/R5XD0D5jn3TCgZcMThA6H3a VkEghVg+s7uMfL/UEebOBQWXQJ/uVoknMA== -----END CERTIFICATE----- Could this be valid? I definitely ask the owner of the certificate to create a new certificate containing DNS entries in the subjectAltName. Best regards Andy Signer --------------------------------------------------------------------- To unsubscribe, e-mail: httpclient-users-unsubscr...@hc.apache.org For additional commands, e-mail: httpclient-users-h...@hc.apache.org