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I set up the site, it runs fine for a few months, then the server stops serving. I don't understand why the settings can't be found because nothing has changed on the server.

This is from the error_askbot_log:

[Thu May 02 12:17:45 2013] [error] [client 127.0.0.1] mod_wsgi (pid=24567): Exception occurred processing WSGI script '/home/username/webapps/askbot/askbotSpirit/django.wsgi'.  
[Thu May 02 12:17:45 2013] [error] [client 127.0.0.1] Traceback (most recent call last):  
[Thu May 02 12:17:45 2013] [error] [client 127.0.0.1]   File "/home/username/lib/python2.7/Django-1.3.1-py2.7.egg/django/core/handlers/wsgi.py", line 272, in __call__  
[Thu May 02 12:17:45 2013] [error] [client 127.0.0.1]     response = self.get_response(request)  
[Thu May 02 12:17:45 2013] [error] [client 127.0.0.1]   File "/home/username/lib/python2.7/Django-1.3.1-py2.7.egg/django/core/handlers/base.py", line 169, in get_response  
[Thu May 02 12:17:45 2013] [error] [client 127.0.0.1]     response = self.handle_uncaught_exception(request, resolver, sys.exc_info())  
[Thu May 02 12:17:45 2013] [error] [client 127.0.0.1]   File "/home/username/lib/python2.7/Django-1.3.1-py2.7.egg/django/core/handlers/base.py", line 218, in handle_uncaught_exception  
[Thu May 02 12:17:45 2013] [error] [client 127.0.0.1]     return callback(request, **param_dict)  
[Thu May 02 12:17:45 2013] [error] [client 127.0.0.1]   File "/home/username/lib/python2.7/Django-1.3.1-py2.7.egg/django/utils/decorators.py", line 93, in _wrapped_view  
[Thu May 02 12:17:45 2013] [error] [client 127.0.0.1]     response = view_func(request, *args, **kwargs)  
[Thu May 02 12:17:45 2013] [error] [client 127.0.0.1]   File "/home/username/lib/python2.7/Django-1.3.1-py2.7.egg/django/views/defaults.py", line 31, in server_error  
[Thu May 02 12:17:45 2013] [error] [client 127.0.0.1]     return http.HttpResponseServerError(t.render(Context({})))  
[Thu May 02 12:17:45 2013] [error] [client 127.0.0.1]   File "/home/username/lib/python2.7/coffin/template/__init__.py", line 55, in render  
[Thu May 02 12:17:45 2013] [error] [client 127.0.0.1]     return super(Template, self).render(**context)  
[Thu May 02 12:17:45 2013] [error] [client 127.0.0.1]   File "/home/username/lib/python2.7/jinja2/environment.py", line 894, in render  
[Thu May 02 12:17:45 2013] [error] [client 127.0.0.1]     return self.environment.handle_exception(exc_info, True)  
[Thu May 02 12:17:45 2013] [error] [client 127.0.0.1]   File "/home/username/webapps/askbot/askbot-discussion/askbot/templates/500.html", line 1, in top-level template code  
[Thu May 02 12:17:45 2013] [error] [client 127.0.0.1]     {% extends "two_column_body.html" %}  
[Thu May 02 12:17:45 2013] [error] [client 127.0.0.1]   File "/home/username/webapps/askbot/askbot-discussion/askbot/templates/two_column_body.html", line 1, in top-level template code  
[Thu May 02 12:17:45 2013] [error] [client 127.0.0.1]     {% extends "base.html" %}  
[Thu May 02 12:17:45 2013] [error] [client 127.0.0.1]   File "/home/username/webapps/askbot/askbot-discussion/askbot/templates/base.html", line 4, in top-level template code  
[Thu May 02 12:17:45 2013] [error] [client 127.0.0.1]     <title>{% block title %}{% endblock %} - {{ settings.APP_TITLE|escape }}</title>  
[Thu May 02 12:17:45 2013] [error] [client 127.0.0.1]   File "/home/username/lib/python2.7/jinja2/environment.py", line 372, in getattr  
[Thu May 02 12:17:45 2013] [error] [client 127.0.0.1]     return getattr(obj, attribute)  
[Thu May 02 12:17:45 2013] [error] [client 127.0.0.1] UndefinedError: 'settings' is undefined

I opened up a shell and the sys.path contains the correct directory of the settings.py file:

'/home/username/webapps/askbot/askbotPaleo'

I was able to access the settings from the shell:

In [9]: settings.APP_TITLE  ==>>  'Sitename Q&A Forum'

I tried to insert logging into the wsqi script because that's the only way I can see the path being used.

/home/username/webapps/askbot/askbotPaleo/django.wsgi

import logging  
logging.debug("current_directory: " + current_directory )  
logging.debug("parent_directory: " + parent_directory )  
logging.debug('DJANGO_SETTINGS_MODULE: ' + os.environ['DJANGO_SETTINGS_MODULE'] )

After I restarted the Apache server, the log files are not being updated.

How should I go about diagnosing why the settings file can't be found?