thanks,
yes, I tried to isolate some pieces with the following snippets: 
use IO::Socket::SSL;
my $client = IO::Socket::SSL->new('host_atlas:1024')
    or die "error=$!, ssl_error=$SSL_ERROR";
print 'done';

[download]
gives 
   >perl test.pl
    done%

use Mojo::IOLoop::Client;
my $client = Mojo::IOLoop::Client->new;
$client->on(connect => sub ($client, $handle) {print "on_connect\n"});
$client->on(error   => sub ($client, $err)    {print "on_error\n"});
$client->connect({address => 'host_atlas', port => 1024});

$client->reactor->start unless $client->reactor->is_running;
print 'done';

[download]
gives 
   >perl test.pl
   -- Emit connect in Mojo::IOLoop::Client (1)
   on_connect
   done%

use feature 'state';
use Mango;
use Mojo::IOLoop::Client;

my $connect_string=$ARGV[0];
sub mango { state $m = Mango->new($connect_string);}
  mango->db('mydb')->list_collections(sub {
   my ($db, $err, $cursor) = @_;
   print "YESSSSSSSSSSS !!!!\n";
 });
 Mojo::IOLoop->start unless Mojo::IOLoop->is_running;

[download]
gives 
   >perl test.pl "$ATLAS_STRING"
   -- Emit connect in Mojo::IOLoop::Client (1)
   -- Emit write in Mojo::IOLoop::Stream (0)
   -- Emit drain in Mojo::IOLoop::Stream (0)
   -- Emit close in Mojo::IOLoop::Stream (2)
   -- Emit error in Mojo::Reactor::Poll (1)
   Mojo::Reactor::Poll: I/O watcher failed: Can't use an undefined value as an ARRAY reference at /var/..../local/lib/perl5/Mango/Cursor.pm line 11.
   done%

In reply to Re^2: Mojolicious connection to Atlas ssl cluster fails: "Premature connection close" by jjmoka
in thread Mojolicious connection to Atlas ssl cluster fails: "Premature connection close" by jjmoka

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