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That the default communication protocol of Key Manager is Thrift. If your setup has a cluster of multiple Key Manager nodes that are fronted by a WSO2 ELB instance for load balancing, change the key management protocol from Thrift to WSClient using the <KeyValidatorClientType> element in <APIM_HOME>/repository/conf/api-manager.xml file. Thrift uses TCP load balancing and the ELB does not support it.
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See in FAQ space: http://docs.wso2.org/display/FAQ/APIM+Common#APIMCommon-CanweusethriftaskeymanagementprotocolwhenkeymanagernodesarefrontedbyELB |
The following diagram depicts the collaboration of these main components with an easily-integrable monitoring and statistics component.
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