Index: Source/cmGlobalGenerator.cxx
--- Source/cmGlobalGenerator.cxx.orig
+++ Source/cmGlobalGenerator.cxx
@@ -2798,6 +2798,9 @@ void cmGlobalGenerator::AddGlobalTarget_Test(
   cmCustomCommandLine singleLine;
   singleLine.push_back(cmSystemTools::GetCTestCommand());
   singleLine.push_back("--force-new-ctest-process");
+  // Skip tests requiring internet access
+  singleLine.push_back("--exclude-regex");
+  singleLine.push_back("\"CMake.FileDownload|CTestTestUpload|RunCMake.ctest_submit\"");
   cmList args(mf->GetDefinition("CMAKE_CTEST_ARGUMENTS"));
   for (auto const& arg : args) {
     singleLine.push_back(arg);