https://community.esri.com/t5/arcgis-field-maps-questions/unable-to-open-error-message/m-p/1671776#M12061 <P>Hello,</P><P>One of our users brought to our attention that Field Maps will not open on their mobile device any longer. The error message reads:</P><P>"Unable to Open</P><P>The resource could not be loaded because the App Transport Security policy requires the use of a secure connection"</P><P>I am able to open the maps on my phone. These are both iPhones. Has anyone else ran into this issue or have an idea on a fix?</P><P>Thanks</P> Tue, 09 Dec 2025 20:28:23 GMT aaronh543 2025-12-09T20:28:23Z https://community.esri.com/t5/arcgis-field-maps-questions/unable-to-open-error-message/m-p/1671776#M12061 <P>Hello,</P><P>One of our users brought to our attention that Field Maps will not open on their mobile device any longer. The error message reads:</P><P>"Unable to Open</P><P>The resource could not be loaded because the App Transport Security policy requires the use of a secure connection"</P><P>I am able to open the maps on my phone. These are both iPhones. Has anyone else ran into this issue or have an idea on a fix?</P><P>Thanks</P> Tue, 09 Dec 2025 20:28:23 GMT https://community.esri.com/t5/arcgis-field-maps-questions/unable-to-open-error-message/m-p/1671776#M12061 aaronh543 2025-12-09T20:28:23Z https://community.esri.com/t5/arcgis-field-maps-questions/unable-to-open-error-message/m-p/1673458#M12085 <P>Hello&nbsp;<a href="https://community.esri.com/t5/user/viewprofilepage/user-id/958252">@aaronh543</a>&nbsp;, what is the device model and OS version of the problematic phone? Does this differ from your iPhone? Is this an error when opening the app or attempting to open a web map?&nbsp;</P> Tue, 16 Dec 2025 23:37:59 GMT https://community.esri.com/t5/arcgis-field-maps-questions/unable-to-open-error-message/m-p/1673458#M12085 ColinLawrence 2025-12-16T23:37:59Z