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    <p>It seems you are using TCP/IP clustering, so that is good. Try the following (from the hazelcast book)</p> <p>If you are making use of iptables, the following rule can be added to allow for outbound traffic from ports 33000-31000:</p> <pre><code>iptables -A OUTPUT -p TCP --dport 33000:31000 -m state --state NEW -j ACCEPT </code></pre> <p>and to control incoming traffic from any address to port 5701:</p> <pre><code>iptables -A INPUT -p tcp -d 0/0 -s 0/0 --dport 5701 -j ACCEPT </code></pre> <p>and to allow incoming multicast traffic:</p> <pre><code>iptables -A INPUT -m pkttype --pkt-type multicast -j ACCEPT </code></pre> <p>Connectivity test If you are having troubles because machines won't join a cluster, you might check the network connectity between the 2 machines. You can use a tool called iperf for that. On one machine you execute: iperf -s -p 5701 This means that you are listening at port 5701. </p> <p>At the other machine you execute the following command:</p> <pre><code>iperf -c 192.168.1.107 -d -p 5701 </code></pre> <p>Where you replace '192.168.1.107' by the ip address of your first machine. If you run the command and you get output like this:</p> <pre><code>------------------------------------------------------------ Server listening on TCP port 5701 TCP window size: 85.3 KByte (default) ------------------------------------------------------------ ------------------------------------------------------------ Client connecting to 192.168.1.107, TCP port 5701 TCP window size: 59.4 KByte (default) ------------------------------------------------------------ [ 5] local 192.168.1.105 port 40524 connected with 192.168.1.107 port 5701 [ 4] local 192.168.1.105 port 5701 connected with 192.168.1.107 port 33641 [ ID] Interval Transfer Bandwidth [ 4] 0.0-10.2 sec 55.8 MBytes 45.7 Mbits/sec [ 5] 0.0-10.3 sec 6.25 MBytes 5.07 Mbits/sec </code></pre> <p>You know the 2 machines can connect to each other. However if you are seeing something like this:</p> <pre><code>Server listening on TCP port 5701 TCP window size: 85.3 KByte (default) ------------------------------------------------------------ connect failed: No route to host </code></pre> <p>Then you know that you might have a network connection problem on your hands.</p>
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    1. POHow do you programmatically configure hazelcast for the multicast discovery mechanism?
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    1. USpveentjer
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    1. COThanks a lot, pveentjer. I tried this on the cluster, but do not have permissions to do so. Instead, I've used com.hazelcast.examples.TestApp to test my network and have updated my original post (last section).
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