diff --git a/paimon-common/src/main/java/org/apache/paimon/security/SecurityConfiguration.java b/paimon-common/src/main/java/org/apache/paimon/security/SecurityConfiguration.java
index 6d928ec4883e..c3ccb44541ec 100644
--- a/paimon-common/src/main/java/org/apache/paimon/security/SecurityConfiguration.java
+++ b/paimon-common/src/main/java/org/apache/paimon/security/SecurityConfiguration.java
@@ -93,6 +93,6 @@ public boolean isLegal() {
             return keytabFile.exists() && keytabFile.isFile() && keytabFile.canRead();
         }
 
-        return true;
+        return false;
     }
 }