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https://issues.apache.org/jira/browse/VYSPER-329?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13471619#comment-13471619
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Justin Spears commented on VYSPER-329:
--------------------------------------

A little more snooping.  So the stream has the correct namespace set, therefore 
the message would be in this namespace.
<stream:stream xmlns="jabber:server" xmlns:db="jabber:server:dialback" 
xmlns:stream="http://etherx.jabber.org/streams"; from="justins-imac" 
xml:lang="en_US" version="1.0" to="jive">

So my guess is that protocol parser is not maintaining the default namespace 
for the messages that are coming underneath it.

                
> Server To Server inbound messages in jabber:server namespace, delivery fails
> ----------------------------------------------------------------------------
>
>                 Key: VYSPER-329
>                 URL: https://issues.apache.org/jira/browse/VYSPER-329
>             Project: VYSPER
>          Issue Type: Bug
>          Components: server-to-server
>    Affects Versions: 0.8
>            Reporter: Justin Spears
>            Priority: Critical
>   Original Estimate: 24h
>  Remaining Estimate: 24h
>
> When recieving messages from external servers, if the message is in the 
> jabber:server namespace the message is not recognized and is sent to the 
> ServiceUnavailableHandler.  This includes all IQ/Presence/... messages.   
> This was discovered testing against Openfire 3.2.  According to a quick look 
> of the rfc these should be accepted.  
> Easy fix it is to change XMPPCoreStanzaHandler to check for either namespace
>  protected boolean verifyNamespace(Stanza stanza) {
>       String namespaceUri = stanza.getNamespaceURI();
>         return NamespaceURIs.JABBER_SERVER.equals(namespaceUri) || 
> NamespaceURIs.JABBER_CLIENT.equals(namespaceUri);
>     }
> I am not entirely sure this the correct way to handle it... but it works.
> It should also log at least debug level when StanzaHandlerLookup  returns 
> SERVICE_UNAVAILABLE_STANZA_ERROR_HANDLER  it would have saved days of 
> debugging.

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