-----------------------------------------------------------------------
successful ldapsearch from command line (returns 264 entries)
 
ldapsearch -h xxx.xxx.xxx.xxx -D "cn=Test User,ou=user,ou=accounts,ou=our,dc=our,dc=domain,dc=com" -W -b "dc=our,dc=domain,dc=com" objectclass=person

-----------------------------------------------------------------------
# config.yml:

plugins:
  Auth::Extensible:
    realms:
      config1:
        provider: LDAP
        host: xxx.xxx.xxx.xxx
        basedn: dc=our,dc=domain,dc=com
        binddn: 'cn=Test User,OU=USER,OU=ACCOUNTS,OU=our,DC=our,DC=domain,DC=com'
        bindpw: password
        username_attribute: sn
        name_attribute: displayName
		

-----------------------------------------------------------------------
# bookstore.pm:

package bookstore;
use Dancer2;
use Dancer2::Plugin::Auth::Extensible;
use Dancer2::Plugin::Auth::Extensible::Provider::LDAP;

our $VERSION = '0.1';

get '/' => sub {
	template 'index' => { 'title' => 'bookstore' };
};

get '/restricted' => require_login sub {
	return "You are logged in!!";
};

true;

-----------------------------------------------------------------------
error message when attempting to login:

[bookstore:7168] core @2020-05-04 21:31:56> looking for post /login in /home/camel/perl5/perlbrew/perls/perl-5.30.1/lib/site_perl/5.30.1/Dancer2/Core/App.pm l. 35
[bookstore:7168] core @2020-05-04 21:31:56> Entering hook core.app.before_request in (eval 305) l. 1
[bookstore:7168] core @2020-05-04 21:31:56> Entering hook plugin.auth_extensible.before_authenticate_user in (eval 305) l. 1
[bookstore:7168] debug @2020-05-04 21:31:56> Attempting to authenticate testuser against realm config1 in /home/camel/perl5/perlbrew/perls/perl-5.30.1/lib/site_perl/5.30.1/Dancer2/Core/Route.pm l. 164
[bookstore:7168] debug @2020-05-04 21:31:57> Binding to LDAP with credentials in /home/camel/perl5/perlbrew/perls/perl-5.30.1/lib/site_perl/5.30.1/Dancer2/Plugin/Auth/Extensible/Provider/LDAP.pm l. 230
[bookstore:7168] error @2020-05-04 21:31:57> config1 provider threw error: LDAP search error: 000004DC: LdapErr: DSID-0C0906DC, comment: In order to perform this operation a successful bind must be completed on the connection., data 0, v1db0 at /home/camel/perl5/perlbrew/perls/perl-5.30.1/lib/site_perl/5.30.1/Dancer2/Plugin/Auth/Extensible.pm line 473. in /home/camel/perl5/perlbrew/perls/perl-5.30.1/lib/site_perl/5.30.1/Dancer2/Core/Route.pm l. 164
[bookstore:7168] core @2020-05-04 21:31:57> Entering hook plugin.auth_extensible.after_authenticate_user in (eval 305) l. 1
[bookstore:7168] core @2020-05-04 21:31:57> looking for get /login in /home/camel/perl5/perlbrew/perls/perl-5.30.1/lib/site_perl/5.30.1/Dancer2/Core/App.pm l. 35
[bookstore:7168] core @2020-05-04 21:31:57> Entering hook core.app.before_request in (eval 305) l. 1
[bookstore:7168] debug @2020-05-04 21:31:57> app has no login template defined in /home/camel/perl5/perlbrew/perls/perl-5.30.1/lib/site_perl/5.30.1/Dancer2/Plugin/Auth/Extensible.pm l. 285
[bookstore:7168] core @2020-05-04 21:31:57> Entering hook core.app.after_request in (eval 305) l. 1
127.0.0.1 - - [04/May/2020:21:31:57 -0400] "POST /login?return_url=%2Frestricted HTTP/1.1" 200 1191 "http://localhost:5000/login?return_url=%2Frestricted" "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:75.0) Gecko/20100101 Firefox/75.0"
127.0.0.1 - - [04/May/2020:21:31:57 -0400] "GET /css/style.css HTTP/1.1" 304 0 "http://localhost:5000/login?return_url=%2Frestricted" "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:75.0) Gecko/20100101 Firefox/75.0"
127.0.0.1 - - [04/May/2020:21:31:57 -0400] "GET /images/perldancer-bg.jpg HTTP/1.1" 304 0 "http://localhost:5000/css/style.css" "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:75.0) Gecko/20100101 Firefox/75.0"