wp-config.php is not writeable

Hello,

Our website has forwarded to the purchased domain.
Based on past experience, we only need to install plug-in “Really Simple SSL” and press the “Activate” button to successfully protect the domain.
But starting in 2023, when we press the “activate” button , the system did not successfully secure the domain. Instead, the following warning message appears: wp-config.php is not writeable.
We don’t know how to enter “wp-config.php” to change to a state that can be written. Could you please tell us how to successfully enable the SSL function?

2nd question: What causes such a problem? And How to avoid encountering this problem?
Our pre-work, including setting up the host, making website content, pointing the ip to the paid domain, etc., are all fixed steps, but starting from 2023, making websites all encounter this same problem.

Thanks

• This topic was modified 2 years, 10 months ago by square77.