What is likely the reason a secured map service is not displayed after credentials are entered, with no error entries in the logs?

A secured map service not displaying after credentials are entered can often indicate an underlying issue that is not immediately apparent, especially if there are no error entries in the logs. When the logging level is set too high, it means that only critical or significant events are being recorded, which can result in the omission of important diagnostic information. As a consequence, issues that might typically generate log entries—such as authorization failures or other more subtle problems—may not be captured.

In this scenario, if the logging does not provide adequate feedback, it becomes challenging to identify the specific reason the map service is not displaying correctly. By lowering the logging threshold, more detailed logs can be generated, which will help to diagnose the problem more effectively. This adjustment is crucial for effective troubleshooting and ensuring that even minor errors are logged and can be analyzed.

Considering the other options, issues related to service publication, incorrect user credentials, or misconfigurations in the ArcGIS Server Manager could also result in a secured map service failing to display. However, these scenarios would typically generate some form of log entry if the logging level was set appropriately, which is not the case here. Thus, adjusting the logging level to capture more detailed information is a key step in resolving this issue.