[zeromq-dev] Remote client does not receive any messages

[Trevor Bernard]

I've used ngrep and ncat with great success in the past to debug
zeromq connectivity issues

On Mon, Dec 1, 2014 at 5:42 PM, Andreas Bauer <dabukster at gmail.com> wrote:
> The code for the test cases is just the one I’ve already attached. Really
> nothing more.
>
> But true, it was a strange network issue. I’ve overlooked that my test
> server’s firewall (Macbook) hat an accepting but also a denying rule for
> incoming traffic for java programs… Sometime, just talking about a problem,
> helps :)
>
>
> Am 1. Dezember 2014 bei 15:11:11, Hintjens Pieter (ph at imatix.com) schrieb:
>
> Could you provide complete minimal test cases for both sides?
>
> As you move pieces to remote boxes, some things take more time. Could
> just be that, nothing weird at the network level.
>
> -Pieter
>
> On Sat, Nov 29, 2014 at 5:22 PM, Andreas Bauer <dabukster at gmail.com> wrote:
>> Hi,
>>
>> it’s one of the standard and basic „can’t receive message" problem
>> questions, but I’m not able to spot the error...
>>
>> I have implemented a simple client and a server using PUB/SUB in java
>> using
>> jeromq 0.3.2 according to the examples in the wiki.
>>
>> If I execute both programms locally, the client receives data. If I deploy
>> the same client jar without change on a remote computer and run it, I
>> don't
>> receive any messages.
>>
>> The client is always using the ip (not „localhost" as hard coded string)
>> of
>> the server in both cases. Thus no changes here for the remote deployment.
>>
>> Firewall should not be an issue either, as the netstat excerpt below shows
>> (Interestingly netstat -a for 0.3.2 shows the below entry, 0.3.4 does
>> not…).
>> The server (for test purpose my Macbook Air) does also not block any
>> outgoing traffic.
>>
>> Any hints? Somehow I'm not able to spot the error (probably something
>> stupid, but too blind to see…)
>>
>> Server.java
>>
>> ZMQ.Context context = ZMQ.context(1);
>> ZMQ.Socket publisher = context.socket(ZMQ.PUB);
>> publisher.bind("tcp://*:5556");
>>
>>
>> Client.java
>>
>> ZMQ.Context context = ZMQ.context(1);
>> ZMQ.Socket subscriber = zmqContext.socket(ZMQ.SUB);
>> subscriber.connect("tcp://192.168.178.21:5556");
>> subscriber.subscribe("".getBytes());
>> Firewall shouldn't be an issue either
>>
>> netstat -a | grep 5556
>>
>> says
>>
>> tcp 0 1 192.168.178.29:38145 192.168.178.21:5556 SYN_SENT
>>
>>
>> Finally my iptables config, just in case I made a stupid configuration
>> mistake here.
>>
>> *filter
>> :INPUT DROP [0:0]
>> :FORWARD ACCEPT [0:0]
>> :OUTPUT ACCEPT [1161:105847]
>> -A INPUT -i lo -j ACCEPT
>> -A INPUT -s 192.168.178.0/24 -j ACCEPT
>> COMMIT
>>
>> Best regards,
>>
>> Andreas
>>
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>>
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