Am i correct that you are saying

I am saying you should employ the Dumpering debugging strategy cause I don't see no Dumpering output in your response

Dumpering is debugging step number one

Dumper your CGI object, Dumper your session object, Dumper whatever else thats important

Basic debugging checklist item 4 ( Dumper )

Then realize the problem, or show me so I can realize the problem for you

print $query->escapeHTML( scalar Dumper( $query, $session ) )

Could you please ...

No thanks ; programming is a process, the only way to get a handle on it is to do these steps yourself;

What you posted doesn't compile, which means you didn't run what you posted to figure out how this works -- that it is working --

Which means you're probably trying to debug this problem in your larger code

That is tough/hard way to go about it; you can read more about this scenario in Re^3: CGI::Session "cache" issue

Thanks for Data::Dumper, info.

After reading CGI::Session twice, dumper data, started to give clues, and using debugging i could solve my session management problem.

But don't know why still, around 6 out of 10, scenarios fails completely in browser and command line mode. No existing session data is captured, or even when session is set to expire in 5 hours, it still creates new session

$VAR1 = bless( { '_STATUS' => 1, '_OBJECTS' => {}, '_CLAIMED_ID' => un
+def, '_DATA' => { '_SESSION_ID' => undef, '_SESSION_ATIME' => undef, 
+'_SESSION_REMOTE_ADDR' => '127.0.0.1', '_SESSION_CTIME' => undef }, '
+_QUERY' => bless( { '.parameters' => [], 'use_tempfile' => 1, '.chars
+et' => 'ISO-8859-1', '.cookies' => undef, '.fieldnames' => {}, 'param
+' => {}, 'escape' => 1 }, 'CGI' ), '_DRIVER_ARGS' => {}, '_DSN' => { 
+'serializer' => 'default', 'id' => 'md5', 'driver' => 'file' } }, 'CG
+I::Session' ); Content-Type: text/html; charset=ISO-8859-1
[download]

code of index.pl

my $cgi = CGI->new;
print $cgi->header();

my $session = CGI::Session->load() or die CGI::Session->errstr;
    if ( $session->is_expired ) 
    {      
        print "Your session timed out! Refresh the screen to start new
+ session!";            
        exit(0);
    }
    elsif ( $session->is_empty ) 
    {
        $session = $session->new() or die $session->errstr;
        print $session->header();                   
        print $session->id();
        $session->expire("5h");
        print "<a href='called.pl'>call</a></br></br>";
        print Dumper($session);
        $session->flush();
    }
    else
    {
    print "session found";
    print "<a href='called.pl'>call</a></br></br>";
    }
[download]

and code of called page

my $cgi = CGI->new;
print $cgi->header();
my $session = CGI::Session->load() or die CGI::Session->errstr;
print Dumper($session);
print "<a href='index.pl'>index</a></br></br>";
$session->flush();
[download]

So, I have to test further, would soon post update on this

But don't know why still, around 6 out of 10, scenarios fails completely in browser

Well, the new code you posted you use  print $cgi->header(); but this will never prints a session cookie, CGI.pm doesn't know anything about CGI::Session, see Re: CGI::Session "cache" issue, use $session->header, otherwise there is no session . no cookie means no sessionid means no session -- it may exist on the server, but the browser doesn't know anything about it (doesn't exist)

fails completely in browser and command line mode.

how are you passing the sessionid on the commandline?