I need to know which version of Telerik Reporting you use. Recently, we have found an issue that was introduced after 184.108.40.206- Exception is thrown when trying to configure Authentication parameters in WebServiceDataSource. If it's the same, you can revert to 220.127.116.11.
We had another issue related to the parameters of WebServiceDataSource in 18.104.22.1688. If you use this version, you need to upgrade to the latest version- 13.2 19.1011.
If the issue is not resolved, I will need more information about it and when exactly the error is thrown. You can also send us screenshots.
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