Layer Loading

• Ensure that QGIS Server WMS and WFS Advertised URLs are blank.
• Ensure that Use layer ids as names is NOT ticked. See Project > Properties > QGIS Server > WMS.
• Check the Network panel in your browser developer tools as you turn on layers. Look at the GetFeature requests and preview the response. If it contains bounding box coordinates but no records, there may be an issue with IIS.

Open the IIS Manager, and recycle the PoziQgisServer application pool.

Projects with transformations

QGIS projects can fail to return layers if there are projection transformations specified the in the project.

Remove any transformations from the project, then save the project and try again.

Project > Properties > Transformations > select and remove any listed transformations

As a preventive measure, see this page about disabling QGIS’s prompt that causes transformation settings to be added to the project.

Public layers

Any layers that are published to the public using Pozi Publisher must be enabled for WFS. The project must also be configured with the export=true keyword.

See Pozi Publisher for more information.

Profiles are used to present a subset of layers for a given task at hand. If the profile is changed, the layers that were previously visible may no longer be visible.

In addition, some external basemaps and imagery layers may also become unavailable. Contact your Pozi support provider and request for the external basemap and imagery layers be configured for all profiles.

Check the following:

• Open the source project in QGIS and see if the layers can be viewed. If not, check whether the source database connection or file path has changed or been removed.
• Review the layer name for punctuation and other non-standard characters. Commas in particular are known to cause the layer to be misinterpreted by Pozi. These characters can still be used in layer names, however to achieve this any non-standard characters need to be removed from the name in the Layer Control. Then go to Layer Properties > QGIS Server > Title, and enter the actual layer name that needs to appear in Pozi. This Title will override the text in the Layer Control.
• Open the source project in QGIS as the PoziService user (Shift-right-click on QGIS desktop shortcut > Run as different user) and see if the layers can be viewed. It’s possible that the PoziService account doesn’t have the same permissions for this layer as the project author.
• Pozi is only able to display features that have at least one valid/non-null attribute. If any records in your data contain no attributes, populate some values into one of the fields.
• Ensure the layer has a coordinate reference system set. Go to Layer Properties > Source > Assigned CRS, and pick a projection
• For file-based layers, ensure that the file path is one that is recognised by the server. See About layer file paths.
• Ensure that any categorised styling is based on a single field with a single value per row. See Categorized Symbology.
• Ensure that any categorised styling is based on a field that is exposed as WFS (ie, ensure the field option ‘Do not expose via WFS’ is unticked).
• If the layer source is a MapInfo table, ensure that the symbology type is not “Embedded Symbols”. Change it to another type such as “Single Symbol” or “Categorized”.

Depending on how QGIS has been installed, some dependency paths may vary.

GDAL_DRIVER_PATH

• GDAL 3.4 and earlier: C:\OSGeo4W\bin\gdalplugins
• GDAL 3.5: C:\OSGeo4W\apps\gdal\lib\gdalplugins

Update the GDAL_DRIVER_PATH environment variable accordingly.