diff --git a/src/main/java/com/alibaba/druid/pool/vendor/OracleValidConnectionChecker.java b/src/main/java/com/alibaba/druid/pool/vendor/OracleValidConnectionChecker.java
index 3d3a82711c..bae9083d13 100644
--- a/src/main/java/com/alibaba/druid/pool/vendor/OracleValidConnectionChecker.java
+++ b/src/main/java/com/alibaba/druid/pool/vendor/OracleValidConnectionChecker.java
@@ -51,6 +51,7 @@ public class OracleValidConnectionChecker implements ValidConnectionChecker, Ser
 
     public boolean isValidConnection(Connection c) {
         try {
+            // unwrap
             Connection conn = (Connection) c.unwrap(clazz);
             if (conn != null) {
                 c = conn;
diff --git a/src/main/java/com/alibaba/druid/pool/vendor/SybaseExceptionSorter.java b/src/main/java/com/alibaba/druid/pool/vendor/SybaseExceptionSorter.java
new file mode 100644
index 0000000000..396cbd58b4
--- /dev/null
+++ b/src/main/java/com/alibaba/druid/pool/vendor/SybaseExceptionSorter.java
@@ -0,0 +1,25 @@
+package com.alibaba.druid.pool.vendor;
+
+import java.io.Serializable;
+import java.sql.SQLException;
+
+import com.alibaba.druid.pool.ExceptionSorter;
+
+public class SybaseExceptionSorter implements ExceptionSorter, Serializable {
+
+    private static final long serialVersionUID = 2742592563671255116L;
+
+    public boolean isExceptionFatal(SQLException e) {
+        boolean result = false;
+
+        String errorText = (e.getMessage()).toUpperCase();
+
+        if ((errorText.indexOf("JZ0C0") > -1) || // ERR_CONNECTION_DEAD
+            (errorText.indexOf("JZ0C1") > -1) // ERR_IOE_KILLED_CONNECTION
+        ) {
+            result = true;
+        }
+
+        return result;
+    }
+}