Maps fail when using Chrome 142+ and local Enterprise

[M678]

Version: 2025.3.1.0.

Due to an update of Chrome (Edge) local network access is no longer allowed per default:

Adapting your website for new Local Network Access restrictions in Chrome

This change conflicts with our SharePoint configuration: SharePoint online + local Enterprise.

The error:

"The specified ArcGIS Online (or ArcGIS Enterprise) URL is not valid."

The specified ArcGIS Online (or ArcGIS Enterprise) URL is not valid.

This is only an issue when the DNS server directs traffic to our Enterprise server directly to the local ip (thus; local network access). When using the external, public DNS server traffic to our Enterprise is directed to our external ip and the SharePoint maps work fine.

In order to fix this two things have to be set:

1.) The LNA policy in the Chrome (Edge) browser needs to be configured:

The site permissions then claim 'lna allowed' (without bothering the user):

Great, so far so good. However the 2nd step is beyond our control:

2.) The iframe tag needs to include 'local-network-access' in the allowed list.

This is the current config (2025.3.1.0):

<iframe frameborder="0" scrolling="no" id="esri-map-123" allow="clipboard-read;clipboard-write;geolocation" width="100%" height="600" src="https://la.arcgis.com/sharePoint/2025.3.1.0/reactapp/?webpartInstanceId=123&amp;isVisitor=1&amp;3d=0&amp;locale=en-us&amp;parentOrigin=abc"></iframe>

Using a local override you can include the lna tag and the site immediately displays our maps again:

<iframe frameborder="0" scrolling="no" id="esri-map-123" allow="local-network-access;clipboard-read;clipboard-write;geolocation" width="100%" height="600" src="https://la.arcgis.com/sharePoint/2025.3.1.0/reactapp/?webpartInstanceId=123&amp;isVisitor=1&amp;3d=0&amp;locale=en-us&amp;parentOrigin=abc"></iframe>

We have submitted a support call with our local reseller, but it is perhaps a bit difficult to reproduce this behaviour since the combination is quite specific.

We also tried adding our own iframe (with the lna tag) and embed the ArcGIS for SharePoint iframe within that. This had no effect; the tag is not inherited. Makes sense from a security standpoint, of course.

Question:
Is there a planned update to add allow="local-network-access" to the configuration in the ArcGIS for SharePoint app? Or is there another recommended solution for the interim?

[RaajRaaj · Accepted solution]

@M678 - 

Hello, 

Thanks for reaching out to us through Esri Community. Also, thanks for bringing this to our attention. The change that you've suggested in your post (The iframe tag needs to include 'local-network-access' in the allowed list) has already been addressed in the application code and will be available in the April 2026 release of ArcGIS for SharePoint.

Additionally, you can update the chrome setting by accessing the below link:

chrome://flags/#local-network-access-check

Please let me know if you have any other questions or concerns.

Thanks & Regards,

Raaj

[M678]

Hello Raaj,

Excellent. Thank you for the quick response and workaround.

April is a bit far off, so I'll see whether we can implement this for the interim.

Best regards,

Jos

[RaajRaaj]

My pleasure. Please let us know if you have any questions or feedback regarding the app features and functionalities.

Thanks & Regards,

Raaj

[RaajRaaj]

Hello @M678 --

The latest version of the ArcGIS for SharePoint app was released on April 9th. The latest version of the app contains the enhancement to allow the app connectivity to ArcGIS Enterprise portals on a local DNS. 

Please let me know if you have any questions.

Microsoft App Source: https://marketplace.microsoft.com/en-US/product/WA200003118?tab=DetailsAndSupport

Thanks & Regards,

Raaj

[M678]

Hello Raaj,

Thank you. Our SharePoint admin notified me as well, but didn't see this fix appear in the 'what's new' page:

What's new in ArcGIS for SharePoint 

Good to hear it has been implemented nonetheless. Think he got it working in our dev environment though not yet in production. I'll try and remember to post an update once we've got it working fully again.

All the best,

Jos

[RaajRaaj]

Hello @M678 --

Thank you for pointing that out! You are absolutely right—the enhancement allowing ArcGIS for SharePoint to connect via local DNS should have been included. This fix is crucial for our users working within internal networks, and I’m updating the blog post right now to ensure it gets the visibility it deserves. I really appreciate you catching that and helping us keep our community informed!

Thanks & Regards,

Raaj

[WetterskipFryslan]

Alright, sounds good. Page still looks identical though?

Anyway, our SharePoint admin implemented the April update and I can indeed see the lna tag in the iframe's allow list so our pages are now working from within the local domain as well.

[RaajRaaj]

Hello @WetterskipFryslan --

I had updated the blog two weeks ago. Please see the screenshots below:

 

 Please let me know if you are able to see the note at the top and the newly added section at the bottom of the page. If you don't see it, please try clearing your browser cache and try once again.

I am glad we were able to resolve the issue in the April 2026 release of ArcGIS for SharePoint.

Please let me know if you have any questions or concerns.

Thanks & Regards,

Raaj