diff --git a/FastGithub.DomainResolve/DomainResolver.cs b/FastGithub.DomainResolve/DomainResolver.cs
index 754f222..fd4c810 100644
--- a/FastGithub.DomainResolve/DomainResolver.cs
+++ b/FastGithub.DomainResolve/DomainResolver.cs
@@ -97,8 +97,8 @@ namespace FastGithub.DomainResolve
                 throw new FastGithubException($"dns{dns}解析不到{domain}的ip");
             }
 
-            // 受干扰的dns，常常返回127.0.0.1来阻断请求
-            if (address.Equals(IPAddress.Loopback))
+            // 不允许域名解析指向FastGithub自身造成消息死循环
+            if (LocalMachine.ContainsIPAddress(address) == true)
             {
                 throw new FastGithubException($"dns{dns}被污染，解析{domain}为{address}");
             }
diff --git a/FastGithub.ReverseProxy/CertGenerator.cs b/FastGithub.ReverseProxy/CertGenerator.cs
index 3ff2db4..8c6c539 100644
--- a/FastGithub.ReverseProxy/CertGenerator.cs
+++ b/FastGithub.ReverseProxy/CertGenerator.cs
@@ -193,7 +193,7 @@ namespace FastGithub.ReverseProxy
         private static string GetSubjectName(X509Certificate cert)
         {
             var subject = cert.SubjectDN.ToString();
-            if (subject.StartsWith("cn=", StringComparison.OrdinalIgnoreCase))
+            if (subject.StartsWith("CN=", StringComparison.OrdinalIgnoreCase))
             {
                 subject = subject[3..];
             }