diff --git a/FastGithub.DomainResolve/DomainResolver.cs b/FastGithub.DomainResolve/DomainResolver.cs
index 5d0bd60..c74cc75 100644
--- a/FastGithub.DomainResolve/DomainResolver.cs
+++ b/FastGithub.DomainResolve/DomainResolver.cs
@@ -74,6 +74,8 @@ namespace FastGithub.DomainResolve
         /// </summary>
         /// <param name="domain"></param>
         /// <param name="cancellationToken"></param>
+        /// <exception cref="OperationCanceledException"></exception>
+        /// <exception cref="FastGithubException"></exception>
         /// <returns></returns>
         public async Task<IPAddress> ResolveAsync(DnsEndPoint domain, CancellationToken cancellationToken = default)
         {
@@ -103,6 +105,7 @@ namespace FastGithub.DomainResolve
         /// </summary>
         /// <param name="domain"></param>
         /// <param name="cancellationToken"></param>
+        /// <exception cref="OperationCanceledException"></exception>
         /// <returns></returns>
         private async Task<IPAddress?> ResolveCoreAsync(DnsEndPoint domain, CancellationToken cancellationToken)
         {
@@ -143,6 +146,7 @@ namespace FastGithub.DomainResolve
         /// </summary>
         /// <param name="domain"></param>
         /// <param name="cancellationToken"></param>
+        /// <exception cref="OperationCanceledException"></exception>
         /// <returns></returns>
         private async Task<IPAddress?> LookupByFallbackAsync(DnsEndPoint domain, CancellationToken cancellationToken)
         {
@@ -163,6 +167,7 @@ namespace FastGithub.DomainResolve
         /// <param name="dns"></param>
         /// <param name="domain"></param>
         /// <param name="cancellationToken"></param>
+        /// <exception cref="OperationCanceledException"></exception>
         /// <returns></returns>
         private async Task<IPAddress?> LookupAsync(IPEndPoint dns, DnsEndPoint domain, CancellationToken cancellationToken)
         {
@@ -184,6 +189,7 @@ namespace FastGithub.DomainResolve
             }
             catch (Exception ex)
             {
+                cancellationToken.ThrowIfCancellationRequested();
                 this.logger.LogWarning($"dns({dns})无法解析{domain.Host}：{ex.Message}");
                 return default;
             }
@@ -195,6 +201,7 @@ namespace FastGithub.DomainResolve
         /// <param name="addresses"></param>
         /// <param name="port"></param>
         /// <param name="cancellationToken"></param>
+        /// <exception cref="OperationCanceledException"></exception>
         /// <returns></returns>
         private async Task<IPAddress?> FindFastValueAsync(IEnumerable<IPAddress> addresses, int port, CancellationToken cancellationToken)
         {
@@ -220,6 +227,7 @@ namespace FastGithub.DomainResolve
         /// <param name="address"></param>
         /// <param name="port"></param>
         /// <param name="cancellationToken"></param>
+        /// <exception cref="OperationCanceledException"></exception>
         /// <returns></returns>
         private async Task<IPAddress?> IsAvailableAsync(IPAddress address, int port, CancellationToken cancellationToken)
         {
@@ -233,6 +241,7 @@ namespace FastGithub.DomainResolve
             }
             catch (OperationCanceledException)
             {
+                cancellationToken.ThrowIfCancellationRequested();
                 this.SetDisabled(address);
                 return default;
             }
diff --git a/FastGithub/Views/Home/Index.cshtml b/FastGithub/Views/Home/Index.cshtml
index 6d17651..b37421c 100644
--- a/FastGithub/Views/Home/Index.cshtml
+++ b/FastGithub/Views/Home/Index.cshtml
@@ -64,7 +64,7 @@
                     <div class="os">linux本机</div>
                     <div class="caption">
                         <h4>x64系统</h4>
-                        <p>执行<code>./FastGithub</code></p>
+                        <p>执行<code>sudo ./FastGithub</code></p>
                         <p>手工添加127.0.0.1做为/etc/resolv.conf的第一条记录</p>
                         <p>手工安装CACert/FastGithub.cer到受信任的根证书颁发机构</p>
                     </div>