To reproduce, disable TLS validation in the settings and run the TLS example server from Tonic (https://github.com/hyperium/tonic/tree/master/examples):
PS C:\Users\Andreas\source\repos\tonic\examples> cargo run --bin tls-server
Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.23s
Running `C:\Users\Andreas\source\repos\tonic\target\debug\tls-server.exe`Then load the UnaryEcho proto file from it, connect to https://localhost:50051/. The UI shows a non-committal error message of client error (Connect):

The Yaak.log contains:
[2025-03-14][18:05:20][[31mERROR[0m][rustls_platform_verifier::verification::windows] failed to verify TLS certificate: invalid peer certificate: UnknownIssuerFrom this, it seems to me like the TLS certificate validation is not disabled by the UI settings.
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Over 1 year ago

Shaderbug
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