--- a/NEWS	Wed Sep 26 15:55:42 2018 +0200
+++ b/NEWS	Thu Sep 27 13:22:57 2018 +0200
@@ -1,6 +1,10 @@
 Pending changes in the mainline
 ===============================
 
+Maintenance
+-----------
+
+* Fix: Closing DICOM associations after running query/retrieve from REST API
 
 
 Version 1.4.2 (2018-09-20)

--- a/OrthancServer/OrthancRestApi/OrthancRestModalities.cpp	Wed Sep 26 15:55:42 2018 +0200
+++ b/OrthancServer/OrthancRestApi/OrthancRestModalities.cpp	Thu Sep 27 13:22:57 2018 +0200
@@ -430,7 +430,7 @@
       Json::Value result = Json::objectValue;
       result["ID"] = s;
       result["Path"] = "/queries/" + s;
-      call.GetOutput().AnswerJson(result);      
+      call.GetOutput().AnswerJson(result);
     }
   }
 

--- a/OrthancServer/QueryRetrieveHandler.cpp	Wed Sep 26 15:55:42 2018 +0200
+++ b/OrthancServer/QueryRetrieveHandler.cpp	Thu Sep 27 13:22:57 2018 +0200
@@ -79,19 +79,6 @@
   {
     done_ = false;
     answers_.Clear();
-    connection_.reset(NULL);
-  }
-
-
-  DicomUserConnection& QueryRetrieveHandler::GetConnection()
-  {
-    if (connection_.get() == NULL)
-    {
-      connection_.reset(new DicomUserConnection(localAet_, modality_));
-      connection_->Open();
-    }
-
-    return *connection_;
   }
 
 
@@ -107,7 +94,11 @@
       // Secondly, possibly fix the query with the user-provider Lua callback
       FixQueryLua(fixed, context_, modality_.GetApplicationEntityTitle()); 
 
-      GetConnection().Find(answers_, level_, fixed);
+      {
+        DicomUserConnection connection(localAet_, modality_);
+        connection.Open();
+        connection.Find(answers_, level_, fixed);
+      }
 
       done_ = true;
     }
@@ -162,20 +153,34 @@
   }
 
 
+  void QueryRetrieveHandler::RetrieveInternal(DicomUserConnection& connection,
+                                              const std::string& target,
+                                              size_t i)
+  {
+    DicomMap map;
+    GetAnswer(map, i);
+    connection.Move(target, map);
+  }
+
+
   void QueryRetrieveHandler::Retrieve(const std::string& target,
                                       size_t i)
   {
-    DicomMap map;
-    GetAnswer(map, i);
-    GetConnection().Move(target, map);
+    DicomUserConnection connection(localAet_, modality_);
+    connection.Open();
+    
+    RetrieveInternal(connection, target, i);
   }
 
 
   void QueryRetrieveHandler::Retrieve(const std::string& target)
   {
+    DicomUserConnection connection(localAet_, modality_);
+    connection.Open();
+        
     for (size_t i = 0; i < GetAnswerCount(); i++)
     {
-      Retrieve(target, i);
+      RetrieveInternal(connection, target, i);
     }
   }
 }

--- a/OrthancServer/QueryRetrieveHandler.h	Wed Sep 26 15:55:42 2018 +0200
+++ b/OrthancServer/QueryRetrieveHandler.h	Thu Sep 27 13:22:57 2018 +0200
@@ -49,11 +49,11 @@
     DicomFindAnswers           answers_;
     std::string                modalityName_;
 
-    std::auto_ptr<DicomUserConnection>  connection_;
-
     void Invalidate();
 
-    DicomUserConnection& GetConnection();
+    void RetrieveInternal(DicomUserConnection& connection,
+                          const std::string& target,
+                          size_t i);
 
   public:
     QueryRetrieveHandler(ServerContext& context);