diff --git a/4chan_x.user.js b/4chan_x.user.js
index 197c155ad..d0c87642e 100644
--- a/4chan_x.user.js
+++ b/4chan_x.user.js
@@ -1839,10 +1839,18 @@
       return qr.message.send(post);
     },
     response: function(html) {
-      var b, err, node, persona, postNumber, reply, thread, _, _ref;
-      if (!(b = $('td b', $.el('a', {
+      var b, doc, err, node, persona, postNumber, reply, thread, _, _ref;
+      doc = $.el('a', {
         innerHTML: html
-      })))) {
+      });
+      if ($('title', doc).textContent === '4chan - Banned') {
+        qr.status({
+          ready: true,
+          banned: true
+        });
+        return;
+      }
+      if (!(b = $('td b', doc))) {
         err = 'Connection error with sys.4chan.org.';
       } else if (b.childElementCount) {
         if (b.firstChild.tagName) {
@@ -1901,8 +1909,11 @@
         return window.postMessage(data, '*');
       },
       receive: function(data) {
-        var _ref;
-        switch (data.req) {
+        var req, _ref;
+        req = data.req;
+        delete data.req;
+        delete data.qr;
+        switch (req) {
           case 'abort':
             if ((_ref = qr.ajax) != null) _ref.abort();
             return qr.message.send({
@@ -1920,7 +1931,6 @@
         var boundary, callbacks, form, i, name, opts, parts, toBin, url, val;
         url = "http://sys.4chan.org/" + data.board + "/post";
         delete data.board;
-        delete data.qr;
         if (engine === 'gecko' && data.upfile) {
           if (!data.binary) {
             toBin = function(data, name, val) {
@@ -2003,7 +2013,17 @@
             'Content-Type': 'multipart/form-data;boundary=' + boundary
           };
         }
-        return qr.ajax = $.ajax(url, callbacks, opts);
+        try {
+          return qr.ajax = $.ajax(url, callbacks, opts);
+        } catch (e) {
+          if (e.name === 'NETWORK_ERR') {
+            return qr.message.send({
+              req: 'status',
+              ready: true,
+              banned: true
+            });
+          }
+        }
       }
     }
   };
diff --git a/script.coffee b/script.coffee
index 95330b6a1..4dadb95a7 100644
--- a/script.coffee
+++ b/script.coffee
@@ -1411,7 +1411,12 @@ qr =
     qr.message.send post
 
   response: (html) ->
-    unless b = $ 'td b', $.el('a', innerHTML: html)
+    doc = $.el 'a', innerHTML: html
+    # Check for ban.
+    if $('title', doc).textContent is '4chan - Banned'
+      qr.status ready: true, banned: true
+      return
+    unless b = $ 'td b', doc
       err = 'Connection error with sys.4chan.org.'
     else if b.childElementCount # error!
       if b.firstChild.tagName # duplicate image link
@@ -1474,7 +1479,10 @@ qr =
           parent
       window.postMessage data, '*'
     receive: (data) ->
-      switch data.req
+      req = data.req
+      delete data.req
+      delete data.qr
+      switch req
         when 'abort'
           qr.ajax?.abort()
           qr.message.send req: 'status'
@@ -1490,7 +1498,6 @@ qr =
       url = "http://sys.4chan.org/#{data.board}/post"
       # Do not append these values to the form.
       delete data.board
-      delete data.qr
 
       # File with filename upload fix from desuwa
       if engine is 'gecko' and data.upfile
@@ -1557,7 +1564,12 @@ qr =
         opts.headers =
           'Content-Type': 'multipart/form-data;boundary=' + boundary
 
-      qr.ajax = $.ajax url, callbacks, opts
+      try
+        qr.ajax = $.ajax url, callbacks, opts
+      catch e
+        # CORS disabled error: redirecting to banned page ;_;
+        if e.name is 'NETWORK_ERR'
+          qr.message.send req: 'status', ready: true, banned: true
 
 options =
   init: ->