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Hello everyone, I'm new as iOS developper, and I'm facing a WebSocket error due to my certificate... Error Name : errSSLXCertChainInvalid Error Code : -9807 I have a server on a device, on which I want to start a secure WebSocket communication (wss://10.0.1.1:8080/). The server has my certificate .pem and works very well with my android App. When I choose Debug in Xcode buildConfiguration, there is no problem for the WebSocket communication (I think Debug doesn't check certificate during the Handshake process). But when I choose Release, I have the error because I didn't add the certificate on the iOS App. I don't really know how to add it properly... But, I also tried to disable HTTPS checks (ATS) : <key>NSAppTransportSecurity</key> <dict> <key>NSAllowsArbitraryLoads</key> <true/> </dict> but that din't work either. If anyone can help me? Thank you