NMAP::Scanner hangs, CL is ok.

[petermilanese]

Greetings-

I have some code that does OS fingerprint/port scans. It uses Nmap::Scanner. For a few particular hosts it will hang on the scan within the module. However, if I execute the nmap line used by the module from the command line it's fine. It seems to only hang when using the Nmap::Scanner module.

For instance - This routine is called:

sub portScan {
        print "Port Scan - ";
        $key = shift;
        my $hostname = $hash{$key}{"Address - FQDN"};
        my $scanner = new Nmap::Scanner;
        $scanner->register_scan_started_event(\&scan_started);
        $scanner->debug(1);
        $scanner->register_scan_complete_event(\&scan_ended);
        $scanner->register_port_found_event(\&port_found);
        $scanner->scan('-sS -p 1-1024,5555,8000-8200 -O --max-rtt-time
+out 100ms --max-retries 2 -T aggressive '. $hostname);
        $scanner->guess_os();
        print "\n";
        #print "$hostname - ".$hash{$key}{'Ports Open'} . "\n";
}

On one host it will return immediately and successfully. On another, it will not. It's literally frozen on that execution all night. However. If I pull the command line executed by the module-

#!/usr/bin/perl

@OU=`/usr/bin/nmap -v -v -v -sS -p 1-1024,5555,8000-8200 -O --max-rtt-
+timeout 100ms --max-retries 2 -T aggressive host.mydomamin.com -oX -`
+;

print @OU;

It returns immediate output :/ Has anyone run into this? Thanks- Pete