diff --git a/tools/internal_ci/helper_scripts/prepare_build_windows.bat b/tools/internal_ci/helper_scripts/prepare_build_windows.bat
index 643eb380e8776df436ff6c32bd10af4ad3b4824a..69e087e1db19a3b0d9f34bb1417adf6ff88e3e51 100644
--- a/tools/internal_ci/helper_scripts/prepare_build_windows.bat
+++ b/tools/internal_ci/helper_scripts/prepare_build_windows.bat
@@ -18,6 +18,13 @@ set PATH=C:\tools\msys64\usr\bin;C:\Python27;%PATH%
 
 bash tools/internal_ci/helper_scripts/gen_report_index.sh
 
+@rem Update DNS settings to:
+@rem 1. allow resolving metadata.google.internal hostname
+@rem 2. make fetching default GCE credential by oauth2client work
+netsh interface ip set dns "Local Area Connection 8" static 169.254.169.254 primary
+netsh interface ip add dnsservers "Local Area Connection 8" 8.8.8.8 index=2
+netsh interface ip add dnsservers "Local Area Connection 8" 8.8.4.4 index=3
+
 @rem Needed for big_query_utils
 python -m pip install google-api-python-client
 
diff --git a/tools/internal_ci/windows/grpc_basictests.cfg b/tools/internal_ci/windows/grpc_basictests.cfg
index a116738651fd105791fc6a1e505d7fc1b13c3868..396d29ef093cf22ea7de76881257f6c109d673d8 100644
--- a/tools/internal_ci/windows/grpc_basictests.cfg
+++ b/tools/internal_ci/windows/grpc_basictests.cfg
@@ -26,5 +26,5 @@ action {
 
 env_vars {
   key: "RUN_TESTS_FLAGS"
-  value: "-f basictests windows -j 1 --inner_jobs 8 --internal_ci"
+  value: "-f basictests windows -j 1 --inner_jobs 8 --internal_ci --bq_result_table aggregate_results"
 }