ContributionsMost RecentMost LikesSolutionsRe: TLS issue with RestSharp in DLL Really?? After one week not one single response?? Is this question so complicated, even for RestSharp insiders? TLS issue with RestSharp in DLL Hello forum, this is my first question here, so please be kind š I generated a C# client using the swagger editor. It created a VS project which I included into my VS solution. Then I created a VS project for a standalone test application to contact the server and retrieve information from the server's REST api. In this project I refer to the IO.Swagger project. This application works very well, I can get all information I want. So far, so fine. Then, in the same VS solution, I created a second project for a DLL which is supposed to be a plugin for another application. In this library project I referred to the same IO.Swagger project as in the test application, as all projects are in the same solution. Unfortunately in the library I can't get a connection to the server because the TLS negotiation fails. The RestClient gives the error message "The request was aborted: Could not create SSL/TLS secure channel.". CAn soneone tell me, what's going wrong? In both cases I use exactly the same IO.Swagger library with the same authorization and credentials, I call the same API method from the same API class but the result is different. I also tried to change the RestSharp version to the ciurrent version, but nothing significantly changed.