diff --git a/deps/oblib/src/rpc/obmysql/ob_mysql_protocol_processor.cpp b/deps/oblib/src/rpc/obmysql/ob_mysql_protocol_processor.cpp
index 74fd06a206..8dbb91fab1 100644
--- a/deps/oblib/src/rpc/obmysql/ob_mysql_protocol_processor.cpp
+++ b/deps/oblib/src/rpc/obmysql/ob_mysql_protocol_processor.cpp
@@ -165,7 +165,8 @@ inline int ObMysqlProtocolProcessor::decode_sslr_body(ObICSMemPool& pool, const
     buf += pktlen;
 
     if (OB_FAIL(sslrpkt->decode())) {
-      LOG_ERROR("failed to decode OMPKSSLRequest", KPC(sslrpkt), K(ret));
+      LOG_WARN("failed to decode OMPKSSLRequest and the socket connection that this session belongs"
+                "to could be an illegal connection", KPC(sslrpkt), K(ret));
     }
   }
   return ret;
diff --git a/deps/oblib/src/rpc/obmysql/packet/ompk_handshake_response.cpp b/deps/oblib/src/rpc/obmysql/packet/ompk_handshake_response.cpp
index 6b90cf90ca..c884ebad4c 100644
--- a/deps/oblib/src/rpc/obmysql/packet/ompk_handshake_response.cpp
+++ b/deps/oblib/src/rpc/obmysql/packet/ompk_handshake_response.cpp
@@ -48,7 +48,7 @@ int OMPKHandshakeResponse::decode()
     capability_.capability_ = uint2korr(pos);
     if (!capability_.cap_flags_.OB_CLIENT_PROTOCOL_41) {
       ret = OB_NOT_SUPPORTED;
-      LOG_ERROR("ob only support mysql client protocol 4.1", K(ret));
+      LOG_WARN("ob only support mysql client protocol 4.1", K(ret));
     } else {
       ObMySQLUtil::get_uint4(pos, capability_.capability_);
       // When the driver establishes a connection, it decides whether to open the CLIENT_MULTI_RESULTS
diff --git a/deps/oblib/src/rpc/obmysql/packet/ompk_ssl_request.cpp b/deps/oblib/src/rpc/obmysql/packet/ompk_ssl_request.cpp
index fefdaff88e..ed264be2ee 100644
--- a/deps/oblib/src/rpc/obmysql/packet/ompk_ssl_request.cpp
+++ b/deps/oblib/src/rpc/obmysql/packet/ompk_ssl_request.cpp
@@ -43,10 +43,10 @@ int OMPKSSLRequest::decode()
     capability_.capability_ = uint2korr(pos);
     if (OB_UNLIKELY(!capability_.cap_flags_.OB_CLIENT_SSL)) {
       ret = OB_ERR_UNEXPECTED;
-      LOG_ERROR("error capability from ssl request packet", K(ret));
+      LOG_WARN("error capability from ssl request packet", K(ret));
     } else if (OB_UNLIKELY(!capability_.cap_flags_.OB_CLIENT_PROTOCOL_41)) {
       ret = OB_NOT_SUPPORTED;
-      LOG_ERROR("ob only support mysql client protocol 4.1", K(ret));
+      LOG_WARN("ob only support mysql client protocol 4.1", K(ret));
     } else {
       if (JDBC_SSL_MIN_SIZE == len) {
         // JConnector only sends server capabilities before starting SSL negotiation.  The below code is patch for this.