diff --git a/lib/faraday/adapter/em_synchrony.rb b/lib/faraday/adapter/em_synchrony.rb
index 305e702f..5a766777 100644
--- a/lib/faraday/adapter/em_synchrony.rb
+++ b/lib/faraday/adapter/em_synchrony.rb
@@ -70,6 +70,12 @@ module Faraday
         else
           raise Error::ConnectionFailed, err
         end
+      rescue RuntimeError => err
+        if err.message == "connection closed by server"
+          raise Error::ConnectionFailed, err
+        else
+          raise
+        end
       rescue => err
         if defined?(OpenSSL) && OpenSSL::SSL::SSLError === err
           raise Faraday::SSLError, err
diff --git a/script/test b/script/test
index 180dbdd3..961d0fc3 100755
--- a/script/test
+++ b/script/test
@@ -132,6 +132,7 @@ if [ -n "$(filter_matching "adapters" "${test_files[@]}")" ]; then
   cleanup() {
     if [ $? -ne 0 ] && [ -n "$TRAVIS" ]; then
       cat log/test.log
+      cat log/proxy.log
     fi
     kill "$server_pid"
     kill "$proxy_pid"
diff --git a/test/adapters/integration.rb b/test/adapters/integration.rb
index 4e0f81cf..800ee388 100644
--- a/test/adapters/integration.rb
+++ b/test/adapters/integration.rb
@@ -207,8 +207,10 @@ module Adapters
           conn.get '/echo'
         end
 
-        unless self.class.ssl_mode? && self.class.jruby?
+        unless self.class.ssl_mode? && (self.class.jruby? ||
+            adapter == :em_http || adapter == :em_synchrony)
           # JRuby raises "End of file reached" which cannot be distinguished from a 407
+          # EM raises "connection closed by server" due to https://github.com/igrigorik/em-socksify/pull/19
           assert_equal %{407 "Proxy Authentication Required "}, err.message
         end
       end