Hi Bui Ding Trung,
There are two options for configuring a PostgreSQL connection which are listed below.
1. Install the ADO.NET Driver for PostgreSQL. This installs the assemblies in the Global Assembly Cache (GAC) and adds the DbProviderFactory to the machine.config.
2. Register the PostgreSQL DbProvider without installing the driver. This involves downloading the assemblies, placing them in the Bin folder under the Stand-Alone Report Designer default installation folder, C:\Program Files (x86)\Progress\Telerik Reporting R3 2019\Report Designer\Bin, and adding the DbProviderFacotry to the Telerik.ReportDesigner.exe.config.
Can you confirm which option is in use? Additionally, can you provide any error messages that you are receiving? Once I have more information about the scenario I can investigate in more detail.
In the meantime, please let me know if you need any additional information. Thank you and I look forward to your reply.
Eric R | Technical Support Engineer
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