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Chances are your User Interface (UI) is throwing an error or receiving an unexpected response from the REST API backend.  Since the UI is Javascript based, it runs entirely in your browser.  That means the error it's hitting is most easily viewed in your browser (and in fact the error may never appear in log files).  

See the Troubleshoot an error page, look for the section on "DSpace 7.x".  It has a guide for locating UI error messages in your browser's Developer Tools.

"500 Service Unavailable" from the User Interface

This error is saying that the frontend is working, but it is unable to communicate with your backend.  It's the same as the "No _links section found at..." error described in the next section. Please follow the troubleshooting details in that section.

"No _links section found at..." error from User Interface

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