diff --git a/src/models/ManifestValidationSchema.ts b/src/models/ManifestValidationSchema.ts
index 6b002ff..82a555e 100644
--- a/src/models/ManifestValidationSchema.ts
+++ b/src/models/ManifestValidationSchema.ts
@@ -725,12 +725,15 @@ const perfValidationSchema = yup.object({
   }),
 });
 
-const allowEndpointValidationSchema = yup.array().of(
-  yup.object({
-    host: yup.string().required('is Required'),
-    port: yup.string().required('is Required'),
-  }),
-);
+const allowEndpointValidationSchema = yup
+  .array()
+  .of(
+    yup.object({
+      host: yup.string().required('is Required'),
+      port: yup.string().required('is Required'),
+    }),
+  )
+  .unique('Host and port combination should be unique', ({ host, port }) => `${host}:${port}`);
 
 const scyllaDbValidationSchema = yup.object({
   name: yup