osx 10.9.3下使用navicat连接sqlserver报错

[FreeTDS][SQL Server]Unable to connect: Adaptive Server is unavailable or does not exist

[FreeTDS][SQL Server]Unable to connect to data source

原因没找到，已经安装freetds，运行tsql之后报错为：

locale is "zh_CN.UTF-8"

locale charset is "UTF-8"

using default charset "UTF-8"

Error 20009 (severity 9):

Unable to connect: Adaptive Server is unavailable or does not exist

OS error 61, "Connection refused"

There was a problem connecting to the server

原因是什么呢？