My team is upgrading SSRS from 2014 to 2019.
Our ASP.NET application integrates with SSRS using Report Viewer controls and we therefore have upgraded these controls to be the 2019 version.
In our testing we find it works well with modern browsers but when we open up a report in IE 11 (we need to support IE 11 for a few more months), the icons that you would typically see for the dropdown arrow, the calendar control, the tool bar controls etc. are not there. In there place is various capital letters (K, H, etc.).
This issue is only happening when we open the reports from our web server where we deploy the app (Win Server 2019 + IIS) . When the developer tests this on their workstation using IE Express and IE 11 the icons are displayed.
In looking at the DOM I believe the issue is with the class values used by the button "chromeless-button glyphui glyphui-calendar" such that it cannot find or render the icon. Maybe there is a setting in IE that might be blocking the loading of these resources. Maybe i have to install ReportViewer on the server (I can see the correct dlls are in the bin folder).
Any help would be greatly appreciated.