2404952 - 500 connection time out on useradmin page

• /useradmin page of Netweaver Java hangs while searching for any user.
• After a period of time you get "500 connection time out" error
• Federated Portal Network(FPN) with remote role assignment(RRA) is configured
• Error in default trace(/usr/sap/<SID>/<instance>/j2ee/cluster/serverx/log) is similar to:

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Error while connecting to remote producer <name>with id <xxxx>

[EXCEPTION]

com.sap.security.core.persistence.remote.CommunicationException: Sending request to connection 'out(port 28020 to address ::ffff:1.226.216.10)).<name>has failed. Please check attached exception.: javax.xml.soap.SOAPException: SOAP Response Message was not well formed (java.io.IOException: Unable to connect to <host:port> - errno: 110 (Connection timed out), error: Connection timed$SingleThread.run(CentralExecutor.java:328)

Caused by: javax.xml.soap.SOAPException: SOAP Response Message was not well formed (java.io.IOException: Unable to connect to <host:port>- errno: 110 (Connection timed out), error: Connection timed out

Text: 500 Internal Server Error is returned for HTTP request [http://<portal host:port>/webdynpro/resources/sap.com/tc~sec~ume~wd~umeadmin/UmeAdminApp]:component [forwardServlet],
web module [webdynpro/dispatcher],
application [sap.com/tc~wd~dispwda],

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  SAP Netweaver Java 7.1 and above

SAP NetWeaver 7.3 ; SAP NetWeaver 7.4 ; SAP NetWeaver 7.5 ; SAP NetWeaver Application Server for Java 7.1 ; SAP NetWeaver Application Server for Java 7.2 ; SAP enhancement package 1 for SAP NetWeaver 7.3 ; SAP enhancement package 1 for SAP NetWeaver Application Server for Java 7.1

Enterprise Portal 7.30, EP 7.30, Enterprise Portal 7.31, EP 7.31, Enterprise Portal 7.40, EP 7.4,Enterprise Portal 7.50, EP 7.5,FPN,producer,consumer,LDAP,authentication,search,useradmin,access,500,hanging , KBA , BC-JAS-SEC-UME , User Management Engine , EP-PIN-FPN-RRA , Federated portal network: Remote Role assignment , EP-PIN-FPN , Federated Portal Network , Problem