You cannot use SYSTEM database user or other database credentials to log on to HANA cockpit or Cockpit Manager.
As of SAP HANA 2.0 SPS 01
COCKPIT_ADMIN, XSA, HANACockpit, cockpit-web-app, SYSTEM , KBA , HAN-CPT-CPT2-ADM , SAP HANA Cockpit 2 (Administration Core) , How To
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