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From Frank Zhang <>
Subject RE: Tips for "No route to host", "Connection refused", "Connection reset"
Date Wed, 25 Apr 2012 22:39:41 GMT
Yes. if you don't have route for 1, it's the same error.
However, even I have route but iptable close it, the error message is the same

-----Original Message-----
From: Ahmad Emneina [] 
Sent: Wednesday, April 25, 2012 3:16 PM
To:; Development discussions for CloudStack (;
CloudStack user/admin discussions (
Subject: Re: Tips for "No route to host", "Connection refused", "Connection reset"

1. Sounds like a routing issue. Packet flow cant reach the destination.
2. Sounds like a firewall/no service issue


On 4/25/12 3:05 PM, "Frank Zhang" <> wrote:

>This is not only for CloudStack, but they are common issues when you are
>playing CloudStack regarding network.
>I often suffer these errors, there are some tips from my practice:
>1.       "No route to host"
>Most likely iptables rule prevents the port from accessing. First check
>iptables rule in your VM, then check SecurityGroup rules in CloudStack.
>Finally check the rules in host where the VM is running(in this case,
>please file a bug for SecurityGroup)
>2.       "Connection refused"
>The destination port is reachable, however, there is no application
>listens on that port
>3.       "Connection reset"
>The established connection has lost.
>Please correct me if you see anything wrong.

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