diff --git a/rest-api/resources/src/main/resources/openapi/deviceAsset/deviceAsset-scopeId-deviceId-_write.yaml b/rest-api/resources/src/main/resources/openapi/deviceAsset/deviceAsset-scopeId-deviceId-_write.yaml
index 7cd1bccbef2..face1e97045 100644
--- a/rest-api/resources/src/main/resources/openapi/deviceAsset/deviceAsset-scopeId-deviceId-_write.yaml
+++ b/rest-api/resources/src/main/resources/openapi/deviceAsset/deviceAsset-scopeId-deviceId-_write.yaml
@@ -80,5 +80,7 @@ paths:
           $ref: '../openapi.yaml#/components/responses/subjectUnauthorized'
         404:
           $ref: '../openapi.yaml#/components/responses/entityNotFound'
+        409:
+          $ref: '../openapi.yaml#/components/responses/conflictDeviceNotConnected'
         500:
           $ref: '../openapi.yaml#/components/responses/kapuaError'
diff --git a/rest-api/resources/src/main/resources/openapi/deviceAsset/deviceAsset-scopeId-deviceId.yaml b/rest-api/resources/src/main/resources/openapi/deviceAsset/deviceAsset-scopeId-deviceId.yaml
index 3614142f48f..075bcf6256c 100644
--- a/rest-api/resources/src/main/resources/openapi/deviceAsset/deviceAsset-scopeId-deviceId.yaml
+++ b/rest-api/resources/src/main/resources/openapi/deviceAsset/deviceAsset-scopeId-deviceId.yaml
@@ -37,6 +37,8 @@ paths:
           $ref: '../openapi.yaml#/components/responses/subjectUnauthorized'
         404:
           $ref: '../openapi.yaml#/components/responses/entityNotFound'
+        409:
+          $ref: '../openapi.yaml#/components/responses/conflictDeviceNotConnected'
         500:
           $ref: '../openapi.yaml#/components/responses/kapuaError'
     post:
diff --git a/rest-api/resources/src/main/resources/openapi/deviceBundle/deviceBundle-scopeId-deviceId-_start.yaml b/rest-api/resources/src/main/resources/openapi/deviceBundle/deviceBundle-scopeId-deviceId-_start.yaml
index 36743c2e1d4..60deb8801f6 100644
--- a/rest-api/resources/src/main/resources/openapi/deviceBundle/deviceBundle-scopeId-deviceId-_start.yaml
+++ b/rest-api/resources/src/main/resources/openapi/deviceBundle/deviceBundle-scopeId-deviceId-_start.yaml
@@ -34,5 +34,7 @@ paths:
           $ref: '../openapi.yaml#/components/responses/subjectUnauthorized'
         404:
           $ref: '../openapi.yaml#/components/responses/entityNotFound'
+        409:
+          $ref: '../openapi.yaml#/components/responses/conflictDeviceNotConnected'
         500:
           $ref: '../openapi.yaml#/components/responses/kapuaError'
diff --git a/rest-api/resources/src/main/resources/openapi/deviceBundle/deviceBundle-scopeId-deviceId-_stop.yaml b/rest-api/resources/src/main/resources/openapi/deviceBundle/deviceBundle-scopeId-deviceId-_stop.yaml
index c857613e39f..af72f4524cc 100644
--- a/rest-api/resources/src/main/resources/openapi/deviceBundle/deviceBundle-scopeId-deviceId-_stop.yaml
+++ b/rest-api/resources/src/main/resources/openapi/deviceBundle/deviceBundle-scopeId-deviceId-_stop.yaml
@@ -34,5 +34,7 @@ paths:
           $ref: '../openapi.yaml#/components/responses/subjectUnauthorized'
         404:
           $ref: '../openapi.yaml#/components/responses/entityNotFound'
+        409:
+          $ref: '../openapi.yaml#/components/responses/conflictDeviceNotConnected'
         500:
           $ref: '../openapi.yaml#/components/responses/kapuaError'
diff --git a/rest-api/resources/src/main/resources/openapi/deviceBundle/deviceBundle-scopeId-deviceId.yaml b/rest-api/resources/src/main/resources/openapi/deviceBundle/deviceBundle-scopeId-deviceId.yaml
index b5a3a458af6..ac0b099240e 100644
--- a/rest-api/resources/src/main/resources/openapi/deviceBundle/deviceBundle-scopeId-deviceId.yaml
+++ b/rest-api/resources/src/main/resources/openapi/deviceBundle/deviceBundle-scopeId-deviceId.yaml
@@ -39,5 +39,7 @@ paths:
           $ref: '../openapi.yaml#/components/responses/subjectUnauthorized'
         404:
           $ref: '../openapi.yaml#/components/responses/entityNotFound'
+        409:
+          $ref: '../openapi.yaml#/components/responses/conflictDeviceNotConnected'
         500:
           $ref: '../openapi.yaml#/components/responses/kapuaError'
diff --git a/rest-api/resources/src/main/resources/openapi/deviceCommand/deviceCommand-scopeId-deviceId-_execute.yaml b/rest-api/resources/src/main/resources/openapi/deviceCommand/deviceCommand-scopeId-deviceId-_execute.yaml
index 22e2455aaf8..799695b6b70 100644
--- a/rest-api/resources/src/main/resources/openapi/deviceCommand/deviceCommand-scopeId-deviceId-_execute.yaml
+++ b/rest-api/resources/src/main/resources/openapi/deviceCommand/deviceCommand-scopeId-deviceId-_execute.yaml
@@ -62,5 +62,7 @@ paths:
           $ref: '../openapi.yaml#/components/responses/subjectUnauthorized'
         404:
           $ref: '../openapi.yaml#/components/responses/entityNotFound'
+        409:
+          $ref: '../openapi.yaml#/components/responses/conflictDeviceNotConnected'
         500:
           $ref: '../openapi.yaml#/components/responses/kapuaError'
diff --git a/rest-api/resources/src/main/resources/openapi/deviceConfiguration/deviceConfiguration-scopeId-deviceId-componentId.yaml b/rest-api/resources/src/main/resources/openapi/deviceConfiguration/deviceConfiguration-scopeId-deviceId-componentId.yaml
index b0f402aa9a4..d38057e0fcd 100644
--- a/rest-api/resources/src/main/resources/openapi/deviceConfiguration/deviceConfiguration-scopeId-deviceId-componentId.yaml
+++ b/rest-api/resources/src/main/resources/openapi/deviceConfiguration/deviceConfiguration-scopeId-deviceId-componentId.yaml
@@ -73,5 +73,7 @@ paths:
           $ref: '../openapi.yaml#/components/responses/subjectUnauthorized'
         404:
           $ref: '../openapi.yaml#/components/responses/entityNotFound'
+        409:
+          $ref: '../openapi.yaml#/components/responses/conflictDeviceNotConnected'
         500:
           $ref: '../openapi.yaml#/components/responses/kapuaError'
diff --git a/rest-api/resources/src/main/resources/openapi/deviceConfiguration/deviceConfiguration-scopeId-deviceId.yaml b/rest-api/resources/src/main/resources/openapi/deviceConfiguration/deviceConfiguration-scopeId-deviceId.yaml
index 5ae8227ca6a..284eea17a19 100644
--- a/rest-api/resources/src/main/resources/openapi/deviceConfiguration/deviceConfiguration-scopeId-deviceId.yaml
+++ b/rest-api/resources/src/main/resources/openapi/deviceConfiguration/deviceConfiguration-scopeId-deviceId.yaml
@@ -71,5 +71,7 @@ paths:
           $ref: '../openapi.yaml#/components/responses/subjectUnauthorized'
         404:
           $ref: '../openapi.yaml#/components/responses/entityNotFound'
+        409:
+          $ref: '../openapi.yaml#/components/responses/conflictDeviceNotConnected'
         500:
           $ref: '../openapi.yaml#/components/responses/kapuaError'
diff --git a/rest-api/resources/src/main/resources/openapi/deviceInventory/deviceInventory-scopeId-deviceId.yaml b/rest-api/resources/src/main/resources/openapi/deviceInventory/deviceInventory-scopeId-deviceId.yaml
index 0913029911a..11079dbef7b 100644
--- a/rest-api/resources/src/main/resources/openapi/deviceInventory/deviceInventory-scopeId-deviceId.yaml
+++ b/rest-api/resources/src/main/resources/openapi/deviceInventory/deviceInventory-scopeId-deviceId.yaml
@@ -257,5 +257,7 @@ paths:
           $ref: '../openapi.yaml#/components/responses/subjectUnauthorized'
         404:
           $ref: '../openapi.yaml#/components/responses/entityNotFound'
+        409:
+          $ref: '../openapi.yaml#/components/responses/conflictDeviceNotConnected'
         500:
           $ref: '../openapi.yaml#/components/responses/kapuaError'
diff --git a/rest-api/resources/src/main/resources/openapi/deviceKeystore/deviceKeystore-scopeId-deviceId.yaml b/rest-api/resources/src/main/resources/openapi/deviceKeystore/deviceKeystore-scopeId-deviceId.yaml
index b0e398a1a4c..2588a34a503 100644
--- a/rest-api/resources/src/main/resources/openapi/deviceKeystore/deviceKeystore-scopeId-deviceId.yaml
+++ b/rest-api/resources/src/main/resources/openapi/deviceKeystore/deviceKeystore-scopeId-deviceId.yaml
@@ -37,6 +37,8 @@ paths:
           $ref: '../openapi.yaml#/components/responses/subjectUnauthorized'
         404:
           $ref: '../openapi.yaml#/components/responses/entityNotFound'
+        409:
+          $ref: '../openapi.yaml#/components/responses/conflictDeviceNotConnected'
         500:
           $ref: '../openapi.yaml#/components/responses/kapuaError'
   /{scopeId}/devices/{deviceId}/keystore/items:
@@ -74,6 +76,8 @@ paths:
           $ref: '../openapi.yaml#/components/responses/subjectUnauthorized'
         404:
           $ref: '../openapi.yaml#/components/responses/entityNotFound'
+        409:
+          $ref: '../openapi.yaml#/components/responses/conflictDeviceNotConnected'
         500:
           $ref: '../openapi.yaml#/components/responses/kapuaError'
   /{scopeId}/devices/{deviceId}/keystore/item:
@@ -113,6 +117,8 @@ paths:
           $ref: '../openapi.yaml#/components/responses/subjectUnauthorized'
         404:
           $ref: '../openapi.yaml#/components/responses/entityNotFound'
+        409:
+          $ref: '../openapi.yaml#/components/responses/conflictDeviceNotConnected'
         500:
           $ref: '../openapi.yaml#/components/responses/kapuaError'
     delete:
@@ -147,6 +153,8 @@ paths:
           $ref: '../openapi.yaml#/components/responses/subjectUnauthorized'
         404:
           $ref: '../openapi.yaml#/components/responses/entityNotFound'
+        409:
+          $ref: '../openapi.yaml#/components/responses/conflictDeviceNotConnected'
         500:
           $ref: '../openapi.yaml#/components/responses/kapuaError'
   /{scopeId}/devices/{deviceId}/keystore/items/certificateInfo:
@@ -175,6 +183,8 @@ paths:
           $ref: '../openapi.yaml#/components/responses/subjectUnauthorized'
         404:
           $ref: '../openapi.yaml#/components/responses/entityNotFound'
+        409:
+          $ref: '../openapi.yaml#/components/responses/conflictDeviceNotConnected'
         500:
           $ref: '../openapi.yaml#/components/responses/kapuaError'
   /{scopeId}/devices/{deviceId}/keystore/items/certificateRaw:
@@ -203,6 +213,8 @@ paths:
           $ref: '../openapi.yaml#/components/responses/subjectUnauthorized'
         404:
           $ref: '../openapi.yaml#/components/responses/entityNotFound'
+        409:
+          $ref: '../openapi.yaml#/components/responses/conflictDeviceNotConnected'
         500:
           $ref: '../openapi.yaml#/components/responses/kapuaError'
   /{scopeId}/devices/{deviceId}/keystore/items/keypair:
@@ -231,6 +243,8 @@ paths:
           $ref: '../openapi.yaml#/components/responses/subjectUnauthorized'
         404:
           $ref: '../openapi.yaml#/components/responses/entityNotFound'
+        409:
+          $ref: '../openapi.yaml#/components/responses/conflictDeviceNotConnected'
         500:
           $ref: '../openapi.yaml#/components/responses/kapuaError'
   /{scopeId}/devices/{deviceId}/keystore/items/csr:
@@ -263,5 +277,7 @@ paths:
           $ref: '../openapi.yaml#/components/responses/subjectUnauthorized'
         404:
           $ref: '../openapi.yaml#/components/responses/entityNotFound'
+        409:
+          $ref: '../openapi.yaml#/components/responses/conflictDeviceNotConnected'
         500:
           $ref: '../openapi.yaml#/components/responses/kapuaError'
diff --git a/rest-api/resources/src/main/resources/openapi/deviceOperation/deviceOperation-scopeId-deviceId.yaml b/rest-api/resources/src/main/resources/openapi/deviceOperation/deviceOperation-scopeId-deviceId.yaml
index 9be2005488d..02ebb6b6383 100644
--- a/rest-api/resources/src/main/resources/openapi/deviceOperation/deviceOperation-scopeId-deviceId.yaml
+++ b/rest-api/resources/src/main/resources/openapi/deviceOperation/deviceOperation-scopeId-deviceId.yaml
@@ -41,7 +41,5 @@ paths:
           $ref: '../openapi.yaml#/components/responses/unauthenticated'
         403:
           $ref: '../openapi.yaml#/components/responses/subjectUnauthorized'
-        409:
-          $ref: '../openapi.yaml#/components/responses/entityUniqueness'
         500:
           $ref: '../openapi.yaml#/components/responses/kapuaError'
diff --git a/rest-api/resources/src/main/resources/openapi/devicePackage/devicePackage-scopeId-deviceId-_download.yaml b/rest-api/resources/src/main/resources/openapi/devicePackage/devicePackage-scopeId-deviceId-_download.yaml
index 1d8fa19627f..9e7e58a0e08 100644
--- a/rest-api/resources/src/main/resources/openapi/devicePackage/devicePackage-scopeId-deviceId-_download.yaml
+++ b/rest-api/resources/src/main/resources/openapi/devicePackage/devicePackage-scopeId-deviceId-_download.yaml
@@ -77,5 +77,7 @@ paths:
           $ref: '../openapi.yaml#/components/responses/subjectUnauthorized'
         404:
           $ref: '../openapi.yaml#/components/responses/entityNotFound'
+        409:
+          $ref: '../openapi.yaml#/components/responses/conflictDeviceNotConnected'
         500:
           $ref: '../openapi.yaml#/components/responses/kapuaError'
diff --git a/rest-api/resources/src/main/resources/openapi/devicePackage/devicePackage-scopeId-deviceId-_uninstall.yaml b/rest-api/resources/src/main/resources/openapi/devicePackage/devicePackage-scopeId-deviceId-_uninstall.yaml
index 1ff65cf3b55..6f336387171 100644
--- a/rest-api/resources/src/main/resources/openapi/devicePackage/devicePackage-scopeId-deviceId-_uninstall.yaml
+++ b/rest-api/resources/src/main/resources/openapi/devicePackage/devicePackage-scopeId-deviceId-_uninstall.yaml
@@ -62,5 +62,7 @@ paths:
           $ref: '../openapi.yaml#/components/responses/subjectUnauthorized'
         404:
           $ref: '../openapi.yaml#/components/responses/entityNotFound'
+        409:
+          $ref: '../openapi.yaml#/components/responses/conflictDeviceNotConnected'
         500:
           $ref: '../openapi.yaml#/components/responses/kapuaError'
diff --git a/rest-api/resources/src/main/resources/openapi/devicePackage/devicePackage-scopeId-deviceId.yaml b/rest-api/resources/src/main/resources/openapi/devicePackage/devicePackage-scopeId-deviceId.yaml
index 6c18ad21cbe..407beff1241 100644
--- a/rest-api/resources/src/main/resources/openapi/devicePackage/devicePackage-scopeId-deviceId.yaml
+++ b/rest-api/resources/src/main/resources/openapi/devicePackage/devicePackage-scopeId-deviceId.yaml
@@ -37,5 +37,7 @@ paths:
           $ref: '../openapi.yaml#/components/responses/subjectUnauthorized'
         404:
           $ref: '../openapi.yaml#/components/responses/entityNotFound'
+        409:
+          $ref: '../openapi.yaml#/components/responses/conflictDeviceNotConnected'
         500:
           $ref: '../openapi.yaml#/components/responses/kapuaError'
diff --git a/rest-api/resources/src/main/resources/openapi/deviceRequest/deviceRequest-scopeId-deviceId.yaml b/rest-api/resources/src/main/resources/openapi/deviceRequest/deviceRequest-scopeId-deviceId.yaml
index 944e173ee44..70fd3e4090c 100644
--- a/rest-api/resources/src/main/resources/openapi/deviceRequest/deviceRequest-scopeId-deviceId.yaml
+++ b/rest-api/resources/src/main/resources/openapi/deviceRequest/deviceRequest-scopeId-deviceId.yaml
@@ -43,5 +43,7 @@ paths:
           $ref: '../openapi.yaml#/components/responses/subjectUnauthorized'
         404:
           $ref: '../openapi.yaml#/components/responses/entityNotFound'
+        409:
+          $ref: '../openapi.yaml#/components/responses/conflictDeviceNotConnected'
         500:
           $ref: '../openapi.yaml#/components/responses/kapuaError'
diff --git a/rest-api/resources/src/main/resources/openapi/deviceSnapshot/deviceSnapshot-scopeId-deviceId-snapshotId-_rollback.yaml b/rest-api/resources/src/main/resources/openapi/deviceSnapshot/deviceSnapshot-scopeId-deviceId-snapshotId-_rollback.yaml
index 7f169c9cf00..05e4466461a 100644
--- a/rest-api/resources/src/main/resources/openapi/deviceSnapshot/deviceSnapshot-scopeId-deviceId-snapshotId-_rollback.yaml
+++ b/rest-api/resources/src/main/resources/openapi/deviceSnapshot/deviceSnapshot-scopeId-deviceId-snapshotId-_rollback.yaml
@@ -34,5 +34,7 @@ paths:
           $ref: '../openapi.yaml#/components/responses/subjectUnauthorized'
         404:
           $ref: '../openapi.yaml#/components/responses/entityNotFound'
+        409:
+          $ref: '../openapi.yaml#/components/responses/conflictDeviceNotConnected'
         500:
           $ref: '../openapi.yaml#/components/responses/kapuaError'
diff --git a/rest-api/resources/src/main/resources/openapi/deviceSnapshot/deviceSnapshot-scopeId-deviceId-snapshotId.yaml b/rest-api/resources/src/main/resources/openapi/deviceSnapshot/deviceSnapshot-scopeId-deviceId-snapshotId.yaml
index 450894f48ca..4fd2ee9b59c 100644
--- a/rest-api/resources/src/main/resources/openapi/deviceSnapshot/deviceSnapshot-scopeId-deviceId-snapshotId.yaml
+++ b/rest-api/resources/src/main/resources/openapi/deviceSnapshot/deviceSnapshot-scopeId-deviceId-snapshotId.yaml
@@ -41,5 +41,7 @@ paths:
           $ref: '../openapi.yaml#/components/responses/subjectUnauthorized'
         404:
           $ref: '../openapi.yaml#/components/responses/entityNotFound'
+        409:
+          $ref: '../openapi.yaml#/components/responses/conflictDeviceNotConnected'
         500:
           $ref: '../openapi.yaml#/components/responses/kapuaError'
diff --git a/rest-api/resources/src/main/resources/openapi/deviceSnapshot/deviceSnapshot-scopeId-deviceId.yaml b/rest-api/resources/src/main/resources/openapi/deviceSnapshot/deviceSnapshot-scopeId-deviceId.yaml
index 151cb34adfc..3b538a8238c 100644
--- a/rest-api/resources/src/main/resources/openapi/deviceSnapshot/deviceSnapshot-scopeId-deviceId.yaml
+++ b/rest-api/resources/src/main/resources/openapi/deviceSnapshot/deviceSnapshot-scopeId-deviceId.yaml
@@ -40,5 +40,7 @@ paths:
           $ref: '../openapi.yaml#/components/responses/subjectUnauthorized'
         404:
           $ref: '../openapi.yaml#/components/responses/entityNotFound'
+        409:
+          $ref: '../openapi.yaml#/components/responses/conflictDeviceNotConnected'
         500:
           $ref: '../openapi.yaml#/components/responses/kapuaError'
diff --git a/rest-api/resources/src/main/resources/openapi/openapi.yaml b/rest-api/resources/src/main/resources/openapi/openapi.yaml
index 437573b7a0c..cc4b14150a3 100644
--- a/rest-api/resources/src/main/resources/openapi/openapi.yaml
+++ b/rest-api/resources/src/main/resources/openapi/openapi.yaml
@@ -804,6 +804,20 @@ components:
         httpErrorCode: 403
         message: "This operation can be performed only on the current logged User."
         kapuaErrorCode: "SELF_MANAGED_ONLY"
+    DeviceNotConnectedExceptionInfo:
+      description: The device is currently disconnected
+      allOf:
+        - $ref: '#/components/schemas/exceptionInfo'
+        - properties:
+            deviceId:
+              description: The id of the disconnected device
+              $ref: '#/components/schemas/kapuaId'
+      example:
+        type: "deviceNotConnectedExceptionInfo"
+        httpErrorCode: 409
+        message: "The device 3243535747637285611 is not CONNECTED. Current device connection status is: null"
+        kapuaErrorCode: "DEVICE_NOT_CONNECTED"
+        deviceId: "LQNak9Yzkus"
     ### Other Base Entities ###
     kapuaListResult:
       description: A container for all the Entities List
@@ -1294,6 +1308,15 @@ components:
         application/xml:
           schema:
             $ref: '#/components/schemas/entityUniquenessExceptionInfo'
+    conflictDeviceNotConnected: #409 response - device not connected
+      description: A conflict in the request - the device is disconnected and the request cannot be accomplished
+      content:
+        application/json:
+          schema:
+            $ref: '#/components/schemas/DeviceNotConnectedExceptionInfo'
+        application/xml:
+          schema:
+            $ref: '#/components/schemas/DeviceNotConnectedExceptionInfo'
   # Security schemes
   securitySchemes:
     kapuaToken: