Third party plugins should be in the plugins folder, in the root of your installation. This folder is already present.
I see the plugin instructions are not correct.
In the zenLdap folder you downloaded you will find a folder named alt (with the lib-auth.php file inside) and a file named ldapLogon.php.
The folder should be renamed to ldapLogon (the same name as the PHP file)
Now just put the folder (ldapLogon) and the file (ldapLogon.php) in the plugins folder in the root of your installation.

Now the plugin should show up in the backend.

Just to be safe you should make a small change to the ldapLogon.php file.
On line 19, function ldapLogon() should be changed to function __construct()

It seems there is a pull request by someone who apparently updated the plugin.
Nice! Didn't see that. Weird that the folder is still named alt.

Quote:In the zenLdap folder you downloaded you will find a folder named alt (with the lib-auth.php file inside) and a file named ldapLogon.php.
The folder should be renamed to ldapLogon (the same name as the PHP file)
Now just put the folder (ldapLogon) and the file (ldapLogon.php) in the plugins folder in the root of your installation.
That's not correct. This plugin has no separate folder. The folder must be in /plugins/alt/ as it is meant that way to take over the authentification process from /zp-core/lib-auth.php that way.

Oops, sorry

Hello,
Thanks for your help.
By the way, I have tried the one you mentioned: "https://github.com/blind-coder/zenLdap" and nothing changes.
Best Regards.

MyAGzenphoto

If you really installed everything correctly in the root plugins folder, I can only suggest to try to contact that author.

Hello,
I am sorry, even by making this changes, it does not work( I cannot see the plugin in the Backend).
Help, I need somebody help, not just anybody help...

Best Regards.

MyAGzenphoto

You are really sure you installed it correctly? Otherwise please review your error log.

Again, the best is to contact the author(s) of the plugins. I am not sure they read here regulary. I sadly cannot help with this plugin.

Hello,
At this point, I think it is a good idea to try to contact that author( "https://github.com/blind-coder/zenLdap").
Can you give me his e-mail so that I can make him aware of my problems with his plugin).
Thanks in advance.

Best Regards.

MyAGzenphoto

I neither know the author nor do I have his email. Sadly he has not opened tickets on his fork repo. Try to comment on the pull request on the original repo. Maybe he sees that and responds.