<span id="result_box" class="" lang="en"><span class="hps">Thanks for your prompt</span> <span class="hps">response</span><span class="">.</span><br> <span class="hps">Maybe i</span> <span class="hps">explained</span> <span class="hps">wrong, the</span> <span class="hps">RabbitMQ</span> <span class="hps">server</span> <span class="hps">works fine:</span> <span class="hps">I can</span> <span class="hps">also</span> <span class="hps">use the plugin</span> <span class="hps">rabbitmq_management</span> <span class="hps">and view all</span> <span class="hps">active queues</span><span>.</span><br>
 <span class="hps">My</span> <span class="hps">problem is different</span><span>, my application</span> <span class="hps">uses a library</span> <span class="hps">AMQP</span><span>-client.jar</span> <span class="hps">to</span> <span class="hps">communicate with the</span> <span class="hps">server</span> <span class="hps atn">rabbit (</span><span>AMQP</span><span class="atn">-client-</span><span>2.7.1.jar</span> <span class="hps">or</span> <span class="hps">AMQP</span><span class="atn">-client-</span><span>2.8.6.jar</span> <span class="hps">depending on the version</span> <span class="hps">of</span> <span class="hps">server).</span><br>
 <span class="hps">Using this library</span> <span class="hps">trying to</span> <span class="hps">connect to the server</span></span><span id="result_box" class="" lang="en"><span class="hps"> rabbit</span></span><span id="result_box" class="" lang="en">, i<span class="hps"> get</span> <span class="hps">the error</span> <br>
 <span class="hps atn">&quot;</span><b><span class="">com.rabbitmq.client.MalformedFrameException</span><span>:</span> <span class="hps">AMQP</span> <span class="hps">protocol version</span><br><span class="hps">mismatch</span></b> <b><span>,</span> <span class="hps">we are</span> <span class="hps">version</span> <span class="hps">0-9-1</span><span>,</span> <span class="hps">server</span> <span class="hps">sent</span> <span class="hps">signature</span> <span class="hps">1,1,0,10</span></b><span class="atn"><b>. </b>&quot;</span><br>
 <span class="hps">It seems</span> <span class="hps">that the client is</span> <span class="hps">incompatible with the</span> <span class="hps">server</span> <span class="hps">...</span> <span class="hps"></span></span><span id="result_box" class="" lang="en"> <span class="hps">which is not true</span> <span class="hps">because they</span> <span class="hps">interact</span> <span class="hps">properly</span> <span class="hps">with</span> <span class="hps">Ubuntu<br>
Regards<br></span></span><br><div class="gmail_quote">On Wed, Aug 29, 2012 at 1:36 PM, Gordon Sim <span dir="ltr">&lt;<a href="mailto:gsim@redhat.com" target="_blank">gsim@redhat.com</a>&gt;</span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div class="im">On 08/29/2012 10:39 AM, Paolo wrote:<br>
</div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div class="im">
I have installed and configured RabbitMQ-server-2.8.6-1 on ubuntu 10.04.<br>
My java web application successfully connects using the library which is<br>
included in RabbitMQ-java-client-bin-2.8.<u></u>6.<br>
I repeated the same installation and configuration on centos 6.3.<br>
When the java application tries to connect to the server rabbit, takes<br>
the error:<br>
&quot;com.rabbitmq.client.<u></u>MalformedFrameException: AMQP protocol version<br>
mismatch, we are version 0-9-1, server sent signature 1,1,0,10&quot;<br>
<br></div>
I tried the same configuration on Ubuntu  and onCentos with<div class="im"><br>
RabbitMQ-server-2.7.1-1 and with the library AMQP-client-2.7.1.jar. The<br>
behavior is the same: it works on ubuntu but I have the same error<br>
message on centos<br>
<br>
someone can give me some indication about ?<br>
</div></blockquote>
<br>
My guess is that on centos you have a Qpid server running on the 5672 port, rather than RabbitMQ (they speak different versions of the protocol). If you stop the qpidd service and start RabbitMQ you should be fine.<br>
<br>
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