Error 500.0 on IIS - The FastCGI process exited unexpectedly

[CarloPoletto]

Hi all,

I developed a Python application in Django using IIS as a web server. Until a few days ago, I used Python 2.7.15 and everything was ok. This week I decided to upgrade the Python version to 3.7 as next year version 2.7 will be deprecated. The application update went very well but now I can no longer host it with IIS due to the following error: Error 500.0 - Internal Server Error The FastCGI process exited unexpectedly

This is my initial configuration:

• Python 3.7.4
• Django 1.11.17
• wfastcgi 3.0.0
• virtualenv 16.6.2

After reading several topics on the subject, I realized that wfastcgi is not compatible with Python 3.7. For this reason I tried to downgrade the application to Python 3.6.8 but nothing has changed. I also read some topics (very old indeed) where it was said that wfastcgi has problems with Python 3.5 and beyond. Although it seemed very strange to me (the PyPi page declares a compatibility up to Python 3.6), I tried to use Python 3.4.2 but I realized that it has already been deprecated and therefore I discard it.

This is my web.config configuration:

<?xml version="1.0" encoding="UTF-8"?>
<configuration>
    <location overrideMode="Deny">
        <system.webServer>
            <handlers>
                <add name="Django Handler" 
                     path="*" 
                     verb="*" 
                     modules="FastCgiModule" 
                     scriptProcessor="C:\MyProject\virtualenv\Scripts\python.exe|C:\MyProject\virtualenv\Lib\site-packages\wfastcgi.py" 
                     resourceType="Unspecified" 
                     requireAccess="Script" />
        </handlers>
    </system.webServer>

    <appSettings>
        <!-- Required settings -->
        <add key="WSGI_HANDLER" value="django.core.wsgi.get_wsgi_application()" />
        <add key="PYTHONPATH" value="C:\MyProject" />

        <!-- Optional settings -->
        <add key="DJANGO_SETTINGS_MODULE" value="myproject.settings" />
    </appSettings>
</location>

[CarloPoletto]

After several attempts I tried to install Python 3.6.8 in C:/Python36 (previously it was in C:/Users/MyUser/AppData/Local/Programs/Python/Python36). This seems to have solved the problem.

[RaymonGulati1]

Glad you solved it!