The event parser service is not necessary to be started to hit the ePO front end. The event parser is just a service that parses the events from the agent to the DB, so seems you might have a DB connection issue.
The un/pw in that core/config page is based on however you have your SQL user setup. Find whatever user you are using for SQL, maybe change its password, then re-input it into the core/config page and test.
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