diff --git a/src/AddIn/RhSolutionsAddIn.cs b/src/AddIn/RhSolutionsAddIn.cs
index 0e51bec..a4c6019 100644
--- a/src/AddIn/RhSolutionsAddIn.cs
+++ b/src/AddIn/RhSolutionsAddIn.cs
@@ -21,9 +21,7 @@ namespace RhSolutions.AddIn
             EventsUtil.Initialize();
 
             ServicePointManager.SecurityProtocol =
-                SecurityProtocolType.Tls12 |
-                SecurityProtocolType.Tls11 |
-                SecurityProtocolType.Tls;
+                SecurityProtocolType.Tls12;
         }
 
         public void AutoClose()
diff --git a/src/RhSolutions.csproj b/src/RhSolutions.csproj
index c46d489..9d07f05 100644
--- a/src/RhSolutions.csproj
+++ b/src/RhSolutions.csproj
@@ -34,6 +34,9 @@
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
   </PropertyGroup>
+  <PropertyGroup>
+    <StartupObject />
+  </PropertyGroup>
   <ItemGroup>
     <Reference Include="ExcelDna.Integration, Version=1.1.0.0, Culture=neutral, PublicKeyToken=f225e9659857edbe, processorArchitecture=MSIL">
       <HintPath>..\packages\ExcelDna.Integration.1.6.0\lib\net452\ExcelDna.Integration.dll</HintPath>