Index: Source/cmGlobalGenerator.cxx
--- Source/cmGlobalGenerator.cxx.orig
+++ Source/cmGlobalGenerator.cxx
@@ -2743,6 +2743,9 @@ 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\"");
   std::vector<std::string> args;
   if (mf->GetDefExpandList("CMAKE_CTEST_ARGUMENTS", args)) {
     for (auto const& arg : args) {
