2331854 - Error on opening My FPN connections

In Enterprise Portal on clicking on  "Manage My FPN Connections"  an error "500 Internal Server Error" is received with the following exception :

java.lang.IllegalArgumentException: No enum const class com.sap.portal.fpn.automation.persistence.type.Protocol.
    at java.lang.Enum.valueOf(Enum.java:196)
    at com.sap.portal.fpn.automation.persistence.type.Protocol.valueOf(Protocol.java:12)
    at com.sap.portal.fpn.automation.persistence.systeminfo.FpnSystemInfo.getSelectedHostData(FpnSystemInfo.java:95)

"Image/data in this KBA is from SAP internal systems, sample data, or demo systems. Any resemblance to real data is purely coincidental."

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• EP Release Independent
• SAP NetWeaver
• SAP Composition Environment

SAP NetWeaver 2004 ; SAP NetWeaver 7.0 ; SAP NetWeaver 7.1 ; SAP NetWeaver 7.2 ; SAP NetWeaver 7.3 ; SAP NetWeaver 7.4 ; SAP NetWeaver 7.5 ; SAP enhancement package 1 for SAP NetWeaver 7.0 ; SAP enhancement package 1 for SAP NetWeaver 7.3 ; SAP enhancement package 2 for SAP NetWeaver 7.0 ; SAP enhancement package 3 for SAP NetWeaver 7.0

Enterprise Portal 7.0, EP 7.0, Enterprise Portal 7.01, EP 7.01, Enterprise Portal 7.02, EP 7.02, Enterprise Portal 7.03, EP 7.03, Enterprise Portal 7.1, EP 7.1, Enterprise Portal 7.2, EP 7.2, 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 No enum const class com.sap.portal.fpn.automation.persistence.type.Protocol, Connections, internal server error, producer, consumer, admin, , KBA , EP-PIN-FPN , Federated Portal Network , Problem