Postgresql uWSGI、Flask、sqlalchemy 和 postgres：SSL 错误：decryption failed or bad record mac

我正在try 使用uWSGI+Nginx设置一个应用程序Web服务器，它使用SQLAlchemy运行一个Flask应用程序，以与Postgres数据库通信.

当我向Web服务器发出请求时，每隔一次响应都会出现500个错误.

错误是:

Traceback (most recent call last):
  File "/var/env/argos/lib/python3.3/site-packages/sqlalchemy/engine/base.py", line 867, in _execute_context
    context)
  File "/var/env/argos/lib/python3.3/site-packages/sqlalchemy/engine/default.py", line 388, in do_execute
    cursor.execute(statement, parameters)
psycopg2.OperationalError: SSL error: decryption failed or bad record mac


The above exception was the direct cause of the following exception:

sqlalchemy.exc.OperationalError: (OperationalError) SSL error: decryption failed or bad record mac

该错误由一个简单的Flask-SQLAlchemy方法触发:

result = models.Event.query.get(id)

uwsgi由supervisor管理，supervisor有一个配置:

[program:my_app]
command=/usr/bin/uwsgi --ini /etc/uwsgi/apps-enabled/myapp.ini --catch-exceptions
directory=/path/to/my/app
stopsignal=QUIT
autostart=true
autorestart=true

uwsgi的配置如下所示:

[uwsgi]
socket = /tmp/my_app.sock
logto = /var/log/my_app.log
plugins = python3
virtualenv =  /path/to/my/venv
pythonpath = /path/to/my/app
wsgi-file = /path/to/my/app/application.py
callable = app
max-requests = 1000
chmod-socket = 666
chown-socket = www-data:www-data
master = true
processes = 2
no-orphans = true
log-date = true
uid = www-data
gid = www-data

我能得到的最远结果是，这与uwsgi的Forking 有关.但除此之外，我不清楚需要做什么.