solusvm的auto ftp backup出现错误Could not connect to master server. Is the master online with port 5656 SSL open 但其他slave机器的autoftpbackup都备份正常，所以不是master的问题。

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Backup Log Started : May 17 2012 01:30:02
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Could not connect to master server. Is the master online with port 5656 SSL open?
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Backup Log Finished : May 17 2012 01:30:02
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在有问题的slave机器上debug，如下：
/usr/bin/php /usr/local/solusvm/includes/autoftpbackup.php --debug=1
Connecting to ctohome.com master: 10x.x.x
Array
(
    [status] => ctohome error
    [statusmsg] => access denied - unknown ctohome ip
    [ip] => 173.x.x.x
)
发现问题：这台slave机器绑定了2个ip，1个是eth0,一个是eth0:1，而这个173.x.x.x是eth0:1
在master的node资料里面，这台slave机器登记的ip是eth0的ip

解决办法：
把master的node资料里面，这台slave机器登记的ip改为eth0:1的173.x.x.x的ip即可