The nomination papers of independent candidate Subhendu Kumar Behera were rejected by the returning officer during scrutiny due to lack of some inputs, official sources said.
The nomination papers of eight candidates were found valid during the scrutiny process, they said, adding a total of nine aspirants had filed their nomination for the by-poll.
The date for withdrawal of papers has been fixed on September 29.
The ruling BJD has fielded Pratyusha Rajeswari Singh, widow of former Kandhamal MP Hemendra Chandra Singh for the by-election which was necessitated due to the demise of her husband on September 5.