I did a search on CPAN for Net::Rexec, and after reading the 4-sentence description, I decided to look at the source code (all 27 lines, or so). Here is a snippet:

sub rexec {
    my($host) = shift;
    my($sock) = IO::Socket::INET->new(PeerAddr => $host,
                      PeerPort => 'exec(512)',
                      Proto => 'tcp');
    die "Error opening sock $!" if (!defined($sock));
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It seems that you have to be careful how you pass the IP address to the sub, otherwise it might get corrupted. I think you need to make sure it gets passed as a string, instead of a number (with 3 decimal points). I created a little testcase to illustrate my point:

#!/usr/bin/env perl
use warnings;
use strict;

foo('111.22.33.44');
foo(111.22.33.44);
sub foo {
    my $host = shift;
    print "host=$host\n";
}
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which prints:

host=111.22.33.44
host=o!,
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I do not know why this happens. Perhaps a more knowledgeable monk can explain.

Update: this is my perl version (just in case this is OS- or version-specific):

This is perl, v5.8.5 built for x86_64-linux-thread-multi
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The 111.22.33.44 is a version string, or "v-string", which you could have also written v111.22.33.44 for a little more clarity. They're described in perldata under "Version Strings" in "Scalar values", which says they're deprecated and going to go away in the future.

First, I'd question whether the remote host provides the rexec service. As far as I know, that's not supported very much anymore and has been mostly replaced with ssh (see Net::SSH). So, check whether this works from the command line before proceeding in Perl.

Second, I'm pretty sure that "[userid, [password]]" in the documentation means that those arguments are optional. Your code should actually say:

($rc, @output) = rexec($addr, $command, $userid, $password );
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As an aside, I'd guess that the contents of @output has newlines already, so you can print it this way:

print @output;
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hello!
We have a program in visual basic 6 that runs that command "rexec", I need to explain a bit, I am trying to make a program that can execute a command in the server, lets call "attend" to the command that I need to run, "attend" is actually a program that has been there for ages, but it has a very important job, this program validates all the operation files, so to run it is quite simple in the server : "attend filename" and that it. But since we are not going to run the "attend" program in the server we need it to run on the pc's.
I know that rexec works.

I hope this can shed more light and you could help me thank you