Why are my http sites not redirecting to https?

I have been trying to get all of my company's http sites to automatically redirect over to https.

In my httpd.conf file, I have the following:

<VirtualHost *:80>  ServerName internal.va.com  Redirect / https://internal.va.com</VirtualHost><VirtualHost _default_:443>  ServerName internal.va.com  DocumentRoot "D:/htdocs"  SSLEngine On</VirtualHost>

When using SSLEngine On, restarting Apache gives me the following error message:

When I comment out SSLEngine On, I no longer get the message, but the sites are not redirecting.

Additionally, I am not sure if I should be adding the server IP address in the VirtualHost tags.

For example:

<VirtualHost 112.245.154.47:80>// same info as above</VirtualHost><VirtualHost 112.245.154.47:443>// same info as above</VirtualHost>

I am not sure if I should be using the server's IP address or if the VirtualHost tag should just include "*:80" and "_ default _:443".

I found this in the error log:

Failed to configure at least one certificate and key for internal.va.com:443

I understand this question may be a duplicate, but I have tried to follow the answers provided under the following questions:

• redirect http to https through httpd.conf

• Redirect HTTP to HTTPS

• Redirect http to https (https works http redirects to default)

None of the above questions have helped me solve my problem. I am still unable to get all of the http sites to redirect over to https.

What can I do to correctly redirect the http sites to https?