This error indicates that Telerik.ReportServer.ServiceAgent service is not running or the server application cannot locate the service at the configured port. I recommend following these steps for troubleshooting the issue:
1. Open Windows Task manager and locate Telerik.ReportServer.ServiceAgent service - double-check that it is running.
2. Open Telerik.ReportServer.ServiceAgent.exe.config located at [installation folder]\Progress\Telerik Report Server\Services and look for the address of the service (baseAddress element). Paste this address in the browser to check if the service is functioning.
3. Open server's Web.config located at [installation folder]\Progress\Telerik Report Server\Telerik.ReportServer.Web and check if the address of the service matches the address provided in Telerik.ReportServer.ServiceAgent.exe.config.
Let us know how it goes and if you manage to resolve the issue.
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