87 is "The parameter is incorrect."

You can use $^E or msdn has a complete list.

$^E = 87;
print $^E, $/;
$^E = 86;
print $^E;
__END__
Output:
The parameter is incorrect
The specified network password is not correct

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In reply to Re: Win32::NetAdmin errors by jsprat
in thread Win32::NetAdmin errors by Anonymous Monk

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