diff --git a/content/post/weird-client-server-connection.md b/content/post/weird-client-server-connection.md
index ae7134aa..6b776020 100644
--- a/content/post/weird-client-server-connection.md
+++ b/content/post/weird-client-server-connection.md
@@ -73,6 +73,23 @@ acl CONNECT method CONNECT
 
 我什麼都沒改呀...
 
+update: 2018/11/19
+
+剛剛在測試一台機器，又發生這個問題
+
+兩台都ping不到對方
+
+![ping不到](http://i.imgur.com/gSD086o.png)
+
+
+什麼事也沒做，就是把ping中斷，然後再ping 一次，居然就可以了
+
+
+![又ping到了](http://i.imgur.com/rvtw0hh.png)
+
+
+##真他X的詭異啊！
+
 <hr>
 
 反正呢...
diff --git a/public/en/sitemap.xml b/public/en/sitemap.xml
index 73190906..c2767c58 100644
--- a/public/en/sitemap.xml
+++ b/public/en/sitemap.xml
@@ -144,13 +144,13 @@
   </url>
   
   <url>
-    <loc>https://h.cowbay.org/categories/ps/</loc>
+    <loc>https://h.cowbay.org/tags/ps/</loc>
     <lastmod>2018-11-05T07:46:53+08:00</lastmod>
     <priority>0</priority>
   </url>
   
   <url>
-    <loc>https://h.cowbay.org/tags/ps/</loc>
+    <loc>https://h.cowbay.org/categories/ps/</loc>
     <lastmod>2018-11-05T07:46:53+08:00</lastmod>
     <priority>0</priority>
   </url>
@@ -202,13 +202,13 @@
   </url>
   
   <url>
-    <loc>https://h.cowbay.org/categories/%E7%AD%86%E8%A8%98/</loc>
+    <loc>https://h.cowbay.org/tags/%E7%AD%86%E8%A8%98/</loc>
     <lastmod>2018-11-15T11:06:28+08:00</lastmod>
     <priority>0</priority>
   </url>
   
   <url>
-    <loc>https://h.cowbay.org/tags/%E7%AD%86%E8%A8%98/</loc>
+    <loc>https://h.cowbay.org/categories/%E7%AD%86%E8%A8%98/</loc>
     <lastmod>2018-11-15T11:06:28+08:00</lastmod>
     <priority>0</priority>
   </url>
diff --git a/public/post/weird-client-server-connection/index.html b/public/post/weird-client-server-connection/index.html
index 66ea4f19..578d6894 100644
--- a/public/post/weird-client-server-connection/index.html
+++ b/public/post/weird-client-server-connection/index.html
@@ -190,6 +190,20 @@ acl CONNECT method CONNECT
 
 <p>我什麼都沒改呀&hellip;</p>
 
+<p>update: 2018/11/19</p>
+
+<p>剛剛在測試一台機器，又發生這個問題</p>
+
+<p>兩台都ping不到對方</p>
+
+<p><img src="http://i.imgur.com/gSD086o.png" alt="ping不到" /></p>
+
+<p>什麼事也沒做，就是把ping中斷，然後再ping 一次，居然就可以了</p>
+
+<p><img src="http://i.imgur.com/rvtw0hh.png" alt="又ping到了" /></p>
+
+<p>##真他X的詭異啊！</p>
+
 <hr>
 
 <p>反正呢&hellip;</p>