diff --git a/FastGithub.DomainResolve/DnsClient.cs b/FastGithub.DomainResolve/DnsClient.cs
index 06116b8..2751488 100644
--- a/FastGithub.DomainResolve/DnsClient.cs
+++ b/FastGithub.DomainResolve/DnsClient.cs
@@ -81,6 +81,7 @@ namespace FastGithub.DomainResolve
             if (cryptDns != null)
             {
                 yield return cryptDns;
+                yield return cryptDns;
             }
 
             foreach (var fallbackDns in this.fastGithubConfig.FallbackDns)
diff --git a/FastGithub.DomainResolve/FastGithub.DomainResolve.csproj b/FastGithub.DomainResolve/FastGithub.DomainResolve.csproj
index 0ad99be..ba4e9a8 100644
--- a/FastGithub.DomainResolve/FastGithub.DomainResolve.csproj
+++ b/FastGithub.DomainResolve/FastGithub.DomainResolve.csproj
@@ -17,4 +17,16 @@
 		</None>
 	</ItemGroup>
 
+	<ItemGroup>
+	  <None Remove="domains.json" />
+	</ItemGroup>
+
+	<ItemGroup>
+	  <Content Include="domains.json">
+	    <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+	    <ExcludeFromSingleFile>true</ExcludeFromSingleFile>
+	    <CopyToPublishDirectory>PreserveNewest</CopyToPublishDirectory>
+	  </Content>
+	</ItemGroup>
+
 </Project>
diff --git a/FastGithub.DomainResolve/domains.json b/FastGithub.DomainResolve/domains.json
new file mode 100644
index 0000000..71d5fc7
--- /dev/null
+++ b/FastGithub.DomainResolve/domains.json
@@ -0,0 +1,22 @@
+[
+  "github.com",
+  "v2ex.com",
+  "alive.github.com",
+  "api.github.com",
+  "collector.githubapp.com",
+  "github.githubassets.com",
+  "avatars.githubusercontent.com",
+  "camo.githubusercontent.com",
+  "github-releases.githubusercontent.com",
+  "raw.githubusercontent.com",
+  "www.gravatar.com",
+  "onedrive.live.com",
+  "cdn.v2ex.com",
+  "microsoft.github.io",
+  "fonts.geekzu.org",
+  "gapis.geekzu.org",
+  "i.stack.imgur.com",
+  "skyapi.onedrive.live.com",
+  "codeproject.freetls.fastly.net",
+  "codeproject.global.ssl.fastly.net"
+]
\ No newline at end of file