3355604 - Via 'HTTP' NWA "System Overview" shows blank page or grey lights and N/A status

The data is not displaying in NWA > System Overview via 'HTTP' protocol. In default Trace, you find the error as below:

[EXCEPTION]
com.sap.engine.interfaces.webservices.runtime.ProtocolExceptionExt: SSL required for this call. For details see log entry.
at com.sap.engine.services.wssec.srt.protocols.ProviderSecurityProtocol.logThrowable(ProviderSecurityProtocol.java:1211)
at com.sap.engine.services.wssec.srt.protocols.ProviderSecurityProtocol.handleRequest(ProviderSecurityProtocol.java:528)
at com.sap.engine.services.webservices.espbase.server.runtime.ProtocolProcessor.protocolsHandleRequest0(ProtocolProcessor.java:95)
at com.sap.engine.services.webservices.espbase.server.runtime.ProtocolProcessor.protocolsHandleRequest(ProtocolProcessor.java:70)

Caused by: com.sap.engine.services.wssec.srt.protocols.AuthorizationException: [com.sap.ASJ.wssec.020611] SSL required for this call. For details see log entry.
at com.sap.engine.services.wssec.srt.protocols.ProviderSecurityProtocol.checkSSLAccess(ProviderSecurityProtocol.java:1181)
at com.sap.engine.services.wssec.srt.protocols.ProviderSecurityProtocol.handleRequest(ProviderSecurityProtocol.java:488)

SAP NetWeaver Application Server Java

SSL required for this call, grey out, HTTP, Forcing HTTPS, System overview, Transport Protocol, JEEMONWS. , KBA , BC-JAS-SEC-WSS , Web Services Security , BC-JAS-ADM-MON , Monitoring , Problem