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The leading " " that currently is generated can cause bad DNS request for hostname=0, this can easily be fixed by adding an ltrim after the rtrim on line 571

$servers = "";
$tmpservers = $this->getConf( 'ServerNames', $domain );
$tok = strtok( $tmpservers, " " );
while ( $tok ) {
	$servers = $servers . " " . $serverpre . $tok . ":" . $this->getConf( 'Port', $domain );
	$tok = strtok( " " );
}
$servers = rtrim( $servers );
$servers = ltrim( $servers );