Hi Kadek and Simeon,
Just chiming in to add a bit more context. I also checked the base URL (https://repo-dev.undiksha.ac.id/oai).
If you visit this link directly in your browser and see an XML page displaying <error code="badVerb">Illegal OAI verb</error>, please don't worry. This is the standard and correct OAI-PMH response when the endpoint is accessed without a specific query parameter.
This response actually confirms Simeon's finding: the server is up, active, and properly parsing OAI requests right now. To view the actual repository information in your browser, you just need to append a valid verb, like so: https://repo-dev.undiksha.ac.id/oai?verb=Identify.
It's highly likely the 504 you experienced earlier was just a temporary server overload or a brief timeout issue during a heavy validation fetch.
Hope this helps clarify!
Best regards,
Agus Dwianto