diff --git a/.devcontainer/post-create.sh b/.devcontainer/post-create.sh
index b880b6188..2b877eef1 100755
--- a/.devcontainer/post-create.sh
+++ b/.devcontainer/post-create.sh
@@ -5,7 +5,13 @@ sudo apt-get update && \
     sudo rm -rf /var/lib/apt/lists/*
 
 echo Install .NET dev certs
-dotnet dev-certs https --trust
+EXIT_CODE=0
+PARTIAL_TRUST_EXIT_CODE=4 # Exit code 4 indicates "partial trust" per aspnetcore#65391.
+dotnet dev-certs https --trust || EXIT_CODE=$?
+if [ "$EXIT_CODE" -ne 0 ] && [ "$EXIT_CODE" -ne "$PARTIAL_TRUST_EXIT_CODE" ]; then
+  echo "dotnet dev-certs https --trust failed with exit code $EXIT_CODE"
+  exit "$EXIT_CODE"
+fi
 
 echo Install Aspire
 curl -sSL https://aspire.dev/install.sh | bash
diff --git a/.github/actions/setup-runtimes-caching/action.yml b/.github/actions/setup-runtimes-caching/action.yml
index 27c4edbf9..73349b920 100644
--- a/.github/actions/setup-runtimes-caching/action.yml
+++ b/.github/actions/setup-runtimes-caching/action.yml
@@ -85,7 +85,13 @@ runs:
       shell: bash
       if: ${{ matrix.os == 'ubuntu-latest' }}
       run: |
-        dotnet dev-certs https --trust
+        EXIT_CODE=0
+        dotnet dev-certs https --trust || EXIT_CODE=$?
+        PARTIAL_TRUST_EXIT_CODE=4 # See aspnetcore#65391: exit code 4 indicates partial trust
+        if [ "$EXIT_CODE" -ne 0 ] && [ "$EXIT_CODE" -ne "$PARTIAL_TRUST_EXIT_CODE" ]; then
+          echo "dotnet dev-certs https --trust failed with exit code $EXIT_CODE"
+          exit "$EXIT_CODE"
+        fi
 
     - name: Setup Node globals
       shell: bash