Download failed.: User has blocked requests through HTTP.

[jujist]

the error prevents any plugin installation and also the same about any updates.
It is a local installation in Linux Mint (no SELinux, no mod_security).
any ideas?

[timkaye]

Have you checked both file permissions and ownership? The owner should be www-data.

[jujist]

I did but nothing changed.

maybe following error will be informative:
ClassicPress could not establish a secure connection to WordPress.org. Please contact your server administrator.

[EliteStarServices]

You need to install a SSL/ CA Certificate so your site can use https.

[ElisabettaCarrara]

You might need to add:

define('FS_METHOD', 'direct');

To your wp-config.php file and also check file permissions and ownership (It means your install is owned by www-data and your user is not in the www-data group so it doesn’t have correct chown on the directory for wp-content)

This boils down on your set up of the local environment, not ClassicPress.

[jujist]

thank you for all replies,

both file/directory permission and FS_METOD is defined correctly,
I suppose that it’s something about HTTPS connection,
but is it true that I need to install SSL certificate on localhost just to be able to download files from https?

[ElisabettaCarrara]

Since localhost takes the plugins and themes from outside localhost (from the real web) I do think you need to follow this guide similar to this one here.

Basically you need to generate a self-signed cert with openssl

[jujist]

you don’t need to install SSL certificate on localhost just to be able to download files from the Internet, and it does not matter HTTP or HTTPS.

Finally I got the solution. The source of problems came from PHP-FPM settings on localhost (Apache virtualHost), since I disabled all PHP-FPM handlers, everything looks normal as should be. Thanks everyone.