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When i want to configure mail server in my ubuntu, i have to restart bind9 after make a Domain Name Server (DNS), but it failed.

it says rndc: connect failed: connection refused

What should I do? Give me the solution. I use linux ubuntu ver 12.04.

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What does your config look like? The config file may not be configured properly, causing this error. – jmreicha Jun 26 '12 at 16:41
Can you provide the log? You can run named with -g so the log is done to stderr. – criziot Jun 26 '12 at 16:58
Are you sure Bind is actually running? Did you perhaps break your config so badly that it is refusing to start? Look at your /var/log/syslog after trying to start/restart bind. – Zoredache Jun 26 '12 at 17:45

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