I can connect securely to my Linux server on Windows using puTTY and Core FTP LE, both to root and to user.

But I want to connect using a Windows PHP program to user using the ssh2 library.

I’ve tried connecting three ways:

1. using the .crt and .key files for the LetsEncrypt certificate for my website,

2. using the rsa private key and .pub files for my user SSH access (via Webuzo, which is similar to cPanel),

3. using the .ppk and .pub files for my user SSH access.

In each case, I get a FALSE (error) value from sh2_auth_pubkey_file.

The functions I am calling are:

Connect:

ssh2_connect(SF::$sec['hostIP'], (int)SF::$sec['securePort']);

Auth:

sh2_auth_pubkey_file(SF::$sftp,SF::$sec['user'],SF::$sec['publicKeyPath'], SF::$sec['privateKeyPath'],SF::$sec['privateKeyPwd']);