I don't think it has anything to do with EC2, but I could be wrong.
Like I said before other ports connect fine, and everything is in the
same subnet.
There's no way for a firewall to interfere as iptables is disabled.

It's a VPC with private (different IPs, you can't have duplicate IP's in EC2).

On Fri, Mar 8, 2013 at 1:22 PM, Christopher Schultz
<ch...@christopherschultz.net> wrote:
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> Frank,
>
> On 3/8/13 2:42 PM, Zippy Zeppoli wrote:
>> So, I have a tomcat7 cluster on AWS with a cluster configuration
>> that works on my local VirtualBox cluster.
>>
>> Specs: - Same config. - Firewall turned off on all hosts. - unicast
>> instead of multicast
>>
>> the following commands time out: nc -zv member1  8080 nc -zv
>> member1 4110
>>
>> They are listening however: tcp        0      0 0.0.0.0:4110
>> 0.0.0.0:* LISTEN tcp        0      0 0.0.0.0:8080
>> 0.0.0.0:* LISTEN
>>
>> tcpdump shows over and over SYN's but no replies on all members:
>> 18:57:23.762712 IP member1: 52548 > 192.168.10.10.g2tag: Flags
>> [S], seq 215397535, win 14600, options [mss 1460,sackOK,TS val
>> 159216257 ecr 0,nop,wscale 7], length 0
>>
>>
>> Connecting to any other port from one member to another works
>> fine, for example ssh.
>>
>> So I can't figure out why network communication works between all
>> hosts, tomcat is listening, but trying to connect to the listening
>> port fails.
>
> Are you using your EC2 internal IP addresses or external PI addresses?
> When you say you have the "same config", I presume that you have
> different IP addresses configured, yes?
>
> - -chris
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