Issues with connecting to Google Cloud SQL via sql proxy

I went through [official guide](https://cloud.google.com/sql/docs/postgres/connect-container-engine) from Google on how to connect to Cloud PostgreSQL.
Unfortunately I get this traceback in logs:
```
2017-08-16T13:05:54.966574354Z Traceback (most recent call last):
2017-08-16T13:05:54.966585403Z File "main.py", line 24, in
2017-08-16T13:05:54.966589301Z web.run_app(app, host='0.0.0.0', port=8000)
2017-08-16T13:05:54.966592142Z File "/usr/local/lib/python3.6/site-packages/aiohttp/web.py", line 422, in run_app
2017-08-16T13:05:54.966596332Z loop.run_until_complete(app.startup())
2017-08-16T13:05:54.966600292Z File "uvloop/loop.pyx", line 1203, in uvloop.loop.Loop.run_until_complete (uvloop/loop.c:25632)
2017-08-16T13:05:54.966603161Z File "/usr/local/lib/python3.6/site-packages/aiohttp/web.py", line 259, in startup
2017-08-16T13:05:54.966606143Z yield from self.on_startup.send(self)
2017-08-16T13:05:54.966608657Z File "/usr/local/lib/python3.6/site-packages/aiohttp/signals.py", line 51, in send
2017-08-16T13:05:54.966611358Z yield from self._send(*args, **kwargs)
2017-08-16T13:05:54.966613597Z File "/usr/local/lib/python3.6/site-packages/aiohttp/signals.py", line 17, in _send
2017-08-16T13:05:54.966616198Z yield from res
2017-08-16T13:05:54.966618974Z File "/opt/broadcasts/storage.py", line 18, in init
2017-08-16T13:05:54.966621447Z password=DB_PASSWORD,
2017-08-16T13:05:54.966623587Z File "/usr/local/lib/python3.6/site-packages/aiopg/utils.py", line 72, in __await__
2017-08-16T13:05:54.966626117Z resp = yield from self._coro
2017-08-16T13:05:54.966628477Z File "/usr/local/lib/python3.6/site-packages/aiopg/sa/engine.py", line 67, in _create_engine
2017-08-16T13:05:54.966630969Z loop=loop, timeout=timeout, **kwargs)
2017-08-16T13:05:54.966633311Z File "/usr/local/lib/python3.6/site-packages/aiopg/utils.py", line 67, in __iter__
2017-08-16T13:05:54.966635821Z resp = yield from self._coro
2017-08-16T13:05:54.966638103Z File "/usr/local/lib/python3.6/site-packages/aiopg/pool.py", line 46, in _create_pool
2017-08-16T13:05:54.966640578Z yield from pool._fill_free_pool(False)
2017-08-16T13:05:54.966643043Z File "/usr/local/lib/python3.6/site-packages/aiopg/pool.py", line 203, in _fill_free_pool
2017-08-16T13:05:54.96664552Z **self._conn_kwargs)
2017-08-16T13:05:54.966647841Z File "/usr/local/lib/python3.6/site-packages/aiopg/utils.py", line 67, in __iter__
2017-08-16T13:05:54.966650378Z resp = yield from self._coro
2017-08-16T13:05:54.966652511Z File "/usr/local/lib/python3.6/site-packages/aiopg/connection.py", line 74, in _connect
2017-08-16T13:05:54.966656672Z yield from conn._poll(waiter, timeout)
2017-08-16T13:05:54.966658967Z File "/usr/local/lib/python3.6/site-packages/aiopg/connection.py", line 239, in _poll
2017-08-16T13:05:54.966661307Z yield from asyncio.shield(cancel(), loop=self._loop)
2017-08-16T13:05:54.966663591Z File "/usr/local/lib/python3.6/site-packages/aiopg/connection.py", line 225, in cancel
2017-08-16T13:05:54.966672795Z self._conn.cancel()
2017-08-16T13:05:54.966675518Z psycopg2.OperationalError: asynchronous connection attempt underway
```
However, when I run application locally and connect via proxy running under docker with my laptop as I host it works fine.
Anyone had problems with Google Cloud like mine?