The version of the Geoserver I'm using is 2.19.2. Actually I had no issue with any kind of previews since the installation and I can still call the WFS layers to use them in QGIS or any other map client. But now somehow when I clicked on any of the WFS types (gml,geojson) on the preview screen, I only receive the message below.
HTTP ERROR 403 Forbidden URI: /data/gaist/ows STATUS: 403 MESSAGE: Forbidden SERVLET: dispatcher
Has anyone else experienced this problem before?