May have found a similar idea, but too tired to give a look

See you next time

src/server.py

@@ -59,10 +59,10 @@ class Server:
 
     async def run_server(self):
         logging.info("===== Started server...")
-        if 0:  # loop.create_connection method (search about Protocol?)
-            reader, _ = await loop.create_connection(host=self.host, port=self.input_port)
+        if 0:  # loop.create_connection method
+            reader, _ = await loop.create_connection(asyncio.Transport, host=self.host, port=self.input_port)
             self._reader = reader
-            _, writer = await loop.create_connection(host=self.host, port=self.output_port)
+            _, writer = await loop.create_connection(asyncio.Transport, host=self.host, port=self.output_port)
             self._writer = writer
         elif 1:  # asyncio.open_connection method
             reader, _ = await asyncio.open_connection(self.host, self.input_port)
@@ -148,6 +148,9 @@ class Server:
 
 
 if __name__ == '__main__':
+    print("https://stackoverflow.com/questions/48023911/aiohttp-error-connect-call-failed-for-multiple-async-requests"
+          "-to-localhost")
+    exit()
     log_formatter = logging.Formatter(
         "%(asctime)s [%(module)-15s %(levelname)-8s]     %(message)s",
         style='%'