[Qgis-user] Online layers (ArcGIS REST, WFS, WMS, WCS) failing on reopenning

[Richard Duivenvoorde]

Hi Nigel,

If your project contains a lot of online layers, there may be a chance that some of them 'time out'.
I know of service providers that do not allow more then one or a few simultaneous connections from one client or IP address to their services (while QGIS is firing a whole set of them just to retrieve all layers in the project).

I'm also aware that service providers do 'throttling' of services: if you do more the x requests met minute, you get a sort of handicap to not request so much.

If I were you I would try to set the Options/Network/Timeout for network requests (ms) to something higher then the default 10s (10000 ms!).  Try to set it to a very high value and see if that helps.

If not, then QGIS could maybe try to not fire so many requests at a time upon opening.
Eg only the visible layers first (and the invisible ones after loading the project).
If so, it would be best if you create an issue and provide a (big) example project file with (preferably open) services and all your network settings. But please first try to play with the 'network timeout'...

Another tip: F12 can show you all network requests that QGIS if firing. IF a layer is failing to load, but the corresponding url's of the layer to the service load in for example a browser, then you can at least tell that it is not the service that is an issue...

Earlier I also have said that I would want to have an option to opt OUT of the requesting the 9 canvases around current mapcanvas. This is often a unnecessary number of requests, just making providing a web service harder...

Regards,

Richard Duivenvoorde

On 17-10-2025 11:39, Nigel Cowlin via QGIS-User wrote:
> Hi,
> Not sure if this is the correct place for this kind of query - sorry if it is not!
> 
> I'm using QGIS 3.34.7-Prizren and have a multi-layered project I regularly use. It includes locally saved layers of various types and quite a few web provided layers such as ArcGIS REST, WFS, WMS, WCS, etc. On reopening the project several of these web provided layers show on the 'Handle Unavailable Layers' pop up and are unavailable in the project. It is random which ones each time. Sometimes they are stubbornly difficult to restore (reconnect/repair data source). There is nothing wrong with the source of these layers. Do you know why this is and can you suggest a solution?
> Thank you.
> Nigel
> 
> Nigel Cowlin BA(Hons) DipLA CMLI
> Director
> 
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