Configuring the connect timeout doesn't change it from the default of 10 second.

[hexadecimal1234]

Describe the bug
Using azure-blob-storage 12.31.3
We are using the azure-storage-blob library to upload files to Azure blob storage. Setting the connectTimeout in the com.azure.core.util.HttpClientOptions object which is then set into com.azure.storage.blob.BlobServiceClientBuilder via the clientOptions() method does not alter the connection timeout. No matter what is set, the connection timeout reverts to the default of 10 seconds.

I tried some different things as well.

I tried creating a com.azure.core.http.netty.NettyAsyncHttpClientBuilder object and directly setting the connection timeout through the API.

I tried the HttpClient.createDefault(HttpClientOptions) method and passing the connection timeout through the HttpClientOptions.

I tried setting the following in the -D properties. -DPROPERTY_AZURE_REQUEST_CONNECT_TIMEOUT=15000

Exception or Stack Trace
=ERROR 2025-12-09 19:52:55.000343 [azure-sdk-global-thread-0] - io.netty.channel.ConnectTimeoutException: connection timed out after 10000 ms: login.microsoftonline.com/2603:1037:1:128:0:0:0:6:443

To Reproduce
Work from a machine without connectivity to Azure due to fire wall. Don't set the proxy configuration. Machine will not be able to reach Azure so the connection timeout will be invoked. Regardless of the configuration of the connect timeout the connection timeout always reports failure after 10 seconds.

Code Snippet
HttpClientOptions clientOptions = new HttpClientOptions();

    clientOptions.setConnectTimeout(Duration.ofMillis(15000));
    if (props.getResponseTimeout() > 0) {
        clientOptions.setResponseTimeout(Duration.ofMillis(props.getResponseTimeout()));
    }
    if (props.getReadTimeout() > 0) {
        clientOptions.setReadTimeout(Duration.ofMillis(props.getReadTimeout()));
    }
    if (props.getWriteTimeout() > 0) {
        clientOptions.setWriteTimeout(Duration.ofMillis(props.getWriteTimeout()));
    }
    blobServiceClientBuilder.clientOptions(clientOptions);

    blobServiceClient = blobServiceClientBuilder.buildClient();

Expected behavior
Configuring the connection timeout should correctly configure the connection timeout. Error message should reflect the configured connection timeout.

Screenshots
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Setup (please complete the following information):

• OS: [e.g. iOS]
• IDE: [e.g. IntelliJ]
• Library/Libraries: [e.g. com.azure:azure-core:1.16.0 (groupId:artifactId:version)]
• Java version: [e.g. 8]
• App Server/Environment: [e.g. Tomcat, WildFly, Azure Function, Apache Spark, Databricks, IDE plugin or anything special]
• Frameworks: [e.g. Spring Boot, Micronaut, Quarkus, etc]

If you suspect a dependency version mismatch (e.g. you see NoClassDefFoundError, NoSuchMethodError or similar), please check out Troubleshoot dependency version conflict article first. If it doesn't provide solution for the problem, please provide:

• verbose dependency tree (mvn dependency:tree -Dverbose)
• exception message, full stack trace, and any available logs

Additional context
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[samvaity]

@ibrandes Could you take a look at the reported bug and provide solution, thanks!