What could cause search filters not to return any results?

A poorly formatted search filter can significantly impact the ability of the system to return any results. When crafting search filters, they must be accurately constructed according to the required syntax and parameters. If there's an error in the format, such as incorrect use of fields, operators, or values, the system may not be able to interpret the request, leading to a lack of results. Ensuring that the filter adheres to the precise syntax and rules for the filtering options in FortiAnalyzer is essential for retrieving data correctly.

Other factors, such as deleted logs, an offline system, or the search not being initiated, may also affect the outcome. However, a properly formatted filter is fundamental to get valid search results, and problems in this area are often more directly impactful on the search functionality.