BadRequestTimeout on CoreClientUtils.SelectEndpoint after Update of Library from 1.4.371.96 to 1.5.374.36

[DerGary]

Type of issue

• Bug
• Enhancement
• Compliance
• Question
• Help wanted

Current Behavior

We currently have the following setup:
ARsim (B&R OPC Simulation) on Windows > WSL containing Docker > Docker Container containing OPCUA Client.

When this Code is execute with Version 1.5.374.36 :

var serverAddress = "opc.tcp://HOSTNAME:4841";
var endpointDescription = CoreClientUtils.SelectEndpoint(
            applicationConfiguration,
            serverAddress,
            useSecurity: true
        );

We obtain the following Exception:

Opc.Ua.ServiceResultException: BadRequestTimeout
    at Opc.Ua.Bindings.ChannelAsyncOperation`1.End(Int32 timeout, Boolean throwOnError)
    at Opc.Ua.Bindings.UaSCUaBinaryClientChannel.EndSendRequest(IAsyncResult result)
    at Opc.Ua.DiscoveryClient.GetEndpoints(RequestHeader requestHeader, String endpointUrl, StringCollection localeIds, StringCollection profileUris, EndpointDescriptionCollection& endpoints)
    at Opc.Ua.DiscoveryClient.GetEndpoints(StringCollection profileUris)
    at Opc.Ua.Client.CoreClientUtils.SelectEndpoint(ApplicationConfiguration application, String discoveryUrl, Boolean useSecurity, Int32 discoverTimeout)

When Version 1.4.371.96 is used instead, it works.

Expected Behavior

endpointDescription is returned and no exception is raised

Steps To Reproduce

As the Setup is somewhat complicated, it is hard to set up a sample to reproduce this.

Environment

- OS: Windows 10
- Environment: VSCode
- Runtime: .Net 8
- Nuget Version: 1.5.374.36
- Component: Opc.Ua.Client
- Server: B&R Simulation

Anything else?

No response

[romanett]

@DerGary I suspect some network issue here or an issue with the server. Could you please create a wireshark trace of the failed communication? If you filter to protocol type opc ua, you could find out if the client acts as defined in the spec.