I have a very similar configuration and I get the exact same error.

Have you open a ticket? Thanks.

On Wednesday, December 18, 2013 2:23:57 AM UTC-8, Pavel Lurye wrote:
>
> Hi,
> CONN_MAX_AGE=None.
> Of course, restarting will fix the problem, but that's not what I'm 
> expecting from django.
> I think this is django bug, but I want to be sure.
>
> вторник, 17 декабря 2013 г., 18:59:46 UTC+4 пользователь Prashanth B 
> написал:
>>
>> I suspect restarting your Web server will fix it as you'll get fresh 
>> connections. What is your CONN_MAX_AGE? 
>> On Dec 17, 2013 4:57 AM, "Pavel Lurye" <[email protected]> wrote:
>>
>>> Hi,
>>> does anyone have used django1.6 persistent connections with postgresql?
>>> I've done a simple test and I'm not sure, that django behaves correctly.
>>> Django can't recover after DB restart, and all further db requests lead 
>>> to server error:
>>> ---------------
>>> Traceback (most recent call last):
>>>   File 
>>> "/venv/local/lib/python2.7/site-packages/django/core/handlers/wsgi.py", 
>>> line 194, in __call__
>>>     signals.request_started.send(sender=self.__class__)
>>>   File 
>>> "/venv/local/lib/python2.7/site-packages/django/dispatch/dispatcher.py", 
>>> line 185, in send
>>>     response = receiver(signal=self, sender=sender, **named)
>>>   File "/venv/local/lib/python2.7/site-packages/django/db/__init__.py", 
>>> line 95, in close_old_connections
>>>     conn.close_if_unusable_or_obsolete()
>>>   File 
>>> "/venv/local/lib/python2.7/site-packages/django/db/backends/__init__.py", 
>>> line 466, in close_if_unusable_or_obsolete
>>>     if self.is_usable():
>>>   File 
>>> "/venv/local/lib/python2.7/site-packages/django/db/backends/postgresql_psycopg2/base.py",
>>>  
>>> line 196, in is_usable
>>>     self.connection.cursor().execute("SELECT 1")
>>> psycopg2.InterfaceError: connection already closed
>>> ---------------
>>>
>>> So, InterfaceError is not catched by django in 
>>> postgresql_psycopg2.DatabaseWrapper.is_usable.
>>>
>>> My test environment is:
>>> Ubuntu 13.10
>>> postgresql 9.1
>>>
>>> Django==1.6.1
>>> psycopg2==2.5.1
>>> uWSGI==1.9.21.1
>>>
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>>

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