我使用的是使用Psycopg2适配器的Django，PostgreSQL设置。启动服务器后，几分钟后会出现此错误。我查了Django + Psycopg2: InterfaceError: only protocol 3 supported。
它说最新版本的Psycopg2需要版本大于7.4的PostgreSQL。我使用的是版本9.3.6，但仍然会出现这个问题。
需要解决方案。
[2015-04-04 19:05:19,118: ERROR/MainProcess] Task app.tasks.task1 [44286fc6-fb25-4a17-a385-8d480d3551d6] raised unexpected: InterfaceError('only protocol 3 supported',)
Traceback (most recent call last):
File "/usr/local/lib/python2.7/dist-packages/celery/app/trace.py", line 240, in trace_task
R = retval = fun(*args, **kwargs)
File "/usr/local/lib/python2.7/dist-packages/celery/app/trace.py", line 438, in __protected_call__
return self.run(*args, **kwargs)
File "/root/grappr-ant-manager/app/tasks.py", line 74, in task1
package = Package.objects.filter(package_name =package_name).get()
File "/usr/local/lib/python2.7/dist-packages/django/db/models/query.py", line 351, in get
num = len(clone)
File "/usr/local/lib/python2.7/dist-packages/django/db/models/query.py", line 122, in __len__
self._fetch_all()
File "/usr/local/lib/python2.7/dist-packages/django/db/models/query.py", line 966, in _fetch_all
self._result_cache = list(self.iterator())
File "/usr/local/lib/python2.7/dist-packages/django/db/models/query.py", line 265, in iterator
for row in compiler.results_iter():
File "/usr/local/lib/python2.7/dist-packages/django/db/models/sql/compiler.py", line 700, in results_iter
for rows in self.execute_sql(MULTI):
File "/usr/local/lib/python2.7/dist-packages/django/db/models/sql/compiler.py", line 784, in execute_sql
cursor = self.connection.cursor()
File "/usr/local/lib/python2.7/dist-packages/django/db/backends/__init__.py", line 165, in cursor
cursor = self.make_debug_cursor(self._cursor())
File "/usr/local/lib/python2.7/dist-packages/django/db/backends/__init__.py", line 138, in _cursor
self.ensure_connection()
File "/usr/local/lib/python2.7/dist-packages/django/db/backends/__init__.py", line 133, in ensure_connection
self.connect()
File "/usr/local/lib/python2.7/dist-packages/django/db/utils.py", line 94, in __exit__
six.reraise(dj_exc_type, dj_exc_value, traceback)
File "/usr/local/lib/python2.7/dist-packages/django/db/backends/__init__.py", line 133, in ensure_connection
self.connect()
File "/usr/local/lib/python2.7/dist-packages/django/db/backends/__init__.py", line 122, in connect
self.connection = self.get_new_connection(conn_params)
File "/usr/local/lib/python2.7/dist-packages/django/db/backends/postgresql_psycopg2/base.py", line 130, in get_new_connection
connection = Database.connect(**conn_params)
File "/usr/local/lib/python2.7/dist-packages/psycopg2/__init__.py", line 164, in connect
conn = _connect(dsn, connection_factory=connection_factory, async=async)
InterfaceError: only protocol 3 supported