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When an ingest fails, it may leave the Matterhorn service in a bad state until subsequent ingests succeed. If you know that was not caused by a Matterhorn issue, you can bring its status back to OK by sanitizing the service:
1. Goto: http://MATTERHORN_URL:PORT
2. Login using credentials (IU: Test+server+documentation)
3. Goto: http://MATTERHORN_URL:PORT/docs.html?path=/services
4. Submit the sanitize form with serviceType=org.opencastproject.ingest&host=http://MATTERHORN_URL:PORT