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Several of you have contacted me with problems using Flex beta 2 to connect to ColdFusion via Flash Remoting. A couple of the issues turned out to be configuration problems in flex-enterprise-services.xml (installed under WEB-INF\flex, and needed by the Flex compiler). Here is the file as it works for me:

<?xml version="1.0" encoding="UTF-8"?>
<services-config xmlns="http://www.macromedia.com/2005/flex-service-config">

<services>

<service id="coldfusionsamples-service"
class="flex.messaging.services.RemotingService"
messageTypes="flex.messaging.messages.RemotingMessage">

<adapters>
<adapter-definition id="cf-object" class="coldfusion.flash.messaging.ColdFusionAdapter" default="true"/>
</adapters>

<destination id="ColdFusion">
<channels>
<channel ref="my-cfamf"/>
</channels>
<properties>
<source>*</source>

<access>

<use-mappings>false</use-mappings>

<method-access-level>remote</method-access-level>
</access>

<property-case>

<force-cfc-lowercase>false</force-cfc-lowercase>

<force-query-lowercase>false</force-query-lowercase>

<force-struct-lowercase>false</force-struct-lowercase>
</property-case>
</properties>
</destination>

</service>

</services>

<security>

<login-command class="flex.messaging.security.JRunLoginCommand" server="JRun"/>

</security>

<channels>

<channel-definition id="my-cfamf" class="mx.messaging.channels.AMFChannel">
<endpoint uri="http://localhost:8500{context.root}/flex2gateway/" class="flex.messaging.endpoints.AMFEndpoint"/>
<properties>
<polling-enabled>false</polling-enabled>
<serialization>
<custom-deserializer type="typed-object" class="coldfusion.flash.messaging.io.amf.serializers.TypedObjectDeserializer" />
</serialization>
</properties>
</channel-definition>
</channels>
<logging>

<target class="flex.messaging.log.ConsoleTarget" level="Debug">
<properties>
<prefix>[Flex] </prefix>
<includeDate>false</includeDate>
<includeTime>false</includeTime>
<includeLevel>false</includeLevel>
<includeCategory>false</includeCategory>
</properties>
<filters>
<pattern>Endpoint.*</pattern>
<pattern>Service.*</pattern>
<pattern>Configuration</pattern>
<pattern>Message.*</pattern>
</filters>
</target>

</logging>

<system>
<locale>
<default-locale>en</default-locale>
<supported-locale>de</supported-locale>
<supported-locale>fr</supported-locale>
<supported-locale>es</supported-locale>
</locale>

<redeploy>
<enabled>true</enabled>
<watch-interval>20</watch-interval>
<watch-file>{context.root}/WEB-INF/flex/flex-enterprise-services.xml</watch-file>
<touch-file>{context.root}/WEB-INF/web.xml</touch-file>
</redeploy>
</system>

</services-config>

If you are not using ColdFusion's integrated HTTP server, be sure to change the port from 8500 (or just drop the port altogether if using port 80).

ColdFusion Flash Remoting Configuration in Flex 2 Beta 2