Apache refuses to start prompting Invalid command 'SSLEngine'Error'
Cause of the problem
This frequently happens on fresh Apache servers. When Apache starts it reads
through the configuration files. When it encounters
SSLEngine directive, it
considers it as unknown. This is caused by the fact that the server’s basic
configuration does not have
mod_ssl module installed or enabled.
On CentOS/RedHat systems
Run the following command to install
sudo yum install mod_ssl
On Ubuntu/Debian systems
Run the following command to enable the module:
sudo a2enmod ssl
SSL module should be enabled by now.
How to verify SSL certificates on the command line?
To validate an SSL certificate you can use one of the following approaches, depending on the type of the certificate.Questions
How to generate a private key for the existing .crt file on Nginx?
Unfortunately, this is not possible. You cannot generate a private key out of an existing certificate. If it would be possible, you would be able to impersonate virtually any HTTPS webserver.Questions
Where to keep SSL certificates and private keys on Ubuntu and Debian?
To list all available CA SSL certificates run the following lines of code:Questions
The usual cause is that the implementation of SSL on your server is not correct. The error is usually caused by a server-side problem which the server administrator will need to investigate.Questions
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