Hi yunkpoon2,

Humm, difficult to answer your question. Have you checked your SSL configuration, for example here: https://www.ssllabs.com/ssltest/index.html.

Cheers

Sorry, I get error in image upload via iOS.

Configuration

Protocols
TLS 1.3    No
TLS 1.2    Yes
TLS 1.1    No
TLS 1.0    No
SSL 3    No
SSL 2    No
For TLS 1.3 tests, we currently support draft version 18.



Cipher Suites
# TLS 1.2 (suites in server-preferred order)
TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256 (0xcca9)   ECDH x25519 (eq. 3072 bits RSA)   FS    256
TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256 (0xc02b)   ECDH x25519 (eq. 3072 bits RSA)   FS    128


Protocol Details
DROWN    No, server keys and hostname not seen elsewhere with SSLv2
(1) For a better understanding of this test, please read this longer explanation
(2) Key usage data kindly provided by the Censys network search engine; original DROWN website here
(3) Censys data is only indicative of possible key and certificate reuse; possibly out-of-date and not complete
Secure Renegotiation    Supported
Secure Client-Initiated Renegotiation    No
Insecure Client-Initiated Renegotiation    No
BEAST attack    Mitigated server-side (more info) 
POODLE (SSLv3)    No, SSL 3 not supported (more info)
POODLE (TLS)    No (more info)
Downgrade attack prevention    Unknown (requires support for at least two protocols, excl. SSL2)
SSL/TLS compression    No
RC4    No
Heartbeat (extension)    No
Heartbleed (vulnerability)    No (more info)
Ticketbleed (vulnerability)    No (more info)
OpenSSL CCS vuln. (CVE-2014-0224)    No (more info)
OpenSSL Padding Oracle vuln.
(CVE-2016-2107)    No (more info)
ROBOT (vulnerability)    No (more info)
Forward Secrecy    Yes (with most browsers)   ROBUST (more info)
ALPN    Yes   http/1.1
NPN    Yes   http/1.1
Session resumption (caching)    No (IDs assigned but not accepted)
Session resumption (tickets)    Yes
OCSP stapling    No
Strict Transport Security (HSTS)    No
HSTS Preloading    Not in: Chrome  Edge  Firefox  IE
Public Key Pinning (HPKP)    No (more info)
Public Key Pinning Report-Only    No
Public Key Pinning (Static)    No (more info)
Long handshake intolerance    No
TLS extension intolerance    No
TLS version intolerance    No
Incorrect SNI alerts    No
Uses common DH primes    No, DHE suites not supported
DH public server param (Ys) reuse    No, DHE suites not supported
ECDH public server param reuse    No
Supported Named Groups    x25519, secp256r1 (server preferred order)
SSL 2 handshake compatibility    No