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

Pieter Hintjens ph at imatix.com
Mon Dec 1 15:10:16 CET 2014


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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