1786917 - Cannot open irj/portal application after upgrade

• After upgrade the portal /irj application is not accessible
• You have tested and the J2EE engine is running as normal, also the /nwa and /index.html are accessible
• The following exception is found in the default trace file:

Cannot process an HTTP request to servlet [gateway] in [irj] web application.
[EXCEPTION]
java.lang.NoSuchMethodError: com.sap.security.core.server.csi.XSSEncoder.encodeHTML(Ljava/lang/String;)Ljava/lang/String;
 at com.sapportals.portal.prt.util.DeprecatedStringUtils.escapeToHTML(DeprecatedStringUtils.java:73)
 at com.sapportals.portal.prt.service.document.DocumentHookServiceNew.doDocumentHook(DocumentHookServiceNew.java:242)
 at com.sapportals.portal.prt.connection.PortalHook.doDocumentHook(PortalHook.java:665

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SAP NetWeaver 7.0 ; 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

'Portal Runtime Exception'; 'Upgrade'; '500 internal server'; 'irj'; 'patch inconsistencies'; 'Cannot process an HTTP request to servlet [gateway] in [irj] web application' , KBA , EP-PIN-PRT , Portal Runtime , Problem