--- title: Azure SDK Release (October 2026) | daily.dev description: Azure Core 1.63.0 for .NET adds mTLS proof-of-possession support for client certificate authentication and fixes delays in DefaultAzureCredential when IMDS is... canonical: https://daily.dev/posts/azure-sdk-release-october-2026--ftfku6er9 twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Azure SDK Release (October 2026) | daily.dev og:description: Azure Core 1.63.0 for .NET adds mTLS proof-of-possession support for client certificate authentication and fixes delays in DefaultAzureCredential when IMDS is... og:url: https://daily.dev/posts/azure-sdk-release-october-2026--ftfku6er9 og:image: https://api.daily.dev/og/posts/FtFku6er9.png og:image:alt: Azure SDK Release (October 2026) og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Azure SDK Release (October 2026) **[DevBlogs](https://daily.dev/sources/devblogs)** · 2 min read · 0 upvotes · 0 comments ## Summary Azure Core 1.63.0 for .NET adds mTLS proof-of-possession support for client certificate authentication and fixes delays in DefaultAzureCredential when IMDS is unavailable. Identity 1.26.0 for Python and Identity 1.18.7 for Java add support for user-assigned managed identities on Azure Arc-enabled servers. The Cosmos DB library for Rust hits its first stable 1.0.0 release, requiring preview users to rename feature flags and replace CosmosCredential::MasterKey with CosmosCredential::AccountKey. Several management and client libraries across .NET, Java, JavaScript, Python, Go and Rust also move to initial stable or beta releases. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Questions this post answers ### How do I migrate from the Cosmos DB Rust preview SDK to the stable 1.0 release? Rename the preview_dtx, preview_patch, and preview_opentelemetry feature flags to their unstable_ equivalents, and replace CosmosCredential::MasterKey with CosmosCredential::AccountKey. The 1.0.0 release also changes the User-Agent format and maps specific terminal service errors to synthetic 503 errors while retaining the original wire error in source(). _Developers upgrading Rust Cosmos DB code can track breaking changes like these on daily.dev._ ### Does Azure ManagedIdentityCredential support Azure Arc-enabled servers in Python and Java? Yes, ManagedIdentityCredential in Identity 1.26.0 for Python and Identity 1.18.7 for Java both add support for user-assigned managed identities on Azure Arc-enabled servers, selectable by client ID, object ID, or resource ID. The Java release also fixes native-image compatibility and IMDS discovery timeouts. _Teams rolling out Arc-based managed identity can follow Azure SDK updates like this on daily.dev._ ### How do I keep forcing bearer authentication instead of mTLS proof-of-possession in Azure Core for .NET? Replace the DisableMtlsProofOfPossession = true setting with EnableMtlsProofOfPossession = false. This applies to Azure Core 1.63.0 for .NET, which added mTLS proof-of-possession support for client certificate authentication and the managed identity federated identity flow. _Developers migrating .NET auth settings can track Azure Core changes like this on daily.dev._ ## Similar posts on daily.dev - [Azure SDK Release \(September 2026\)](https://daily.dev/posts/azure-sdk-release-september-2026--n3pkzhgwl) · DevBlogs · 0 upvotes · 0 comments - [Azure SDK Release \(August 2026\)](https://daily.dev/posts/azure-sdk-release-august-2026--f6xyb6bvq) · DevBlogs · 0 upvotes · 0 comments - [Azure SDK Release \(July 2026\)](https://daily.dev/posts/azure-sdk-release-july-2026--rrjj3vk2g) · DevBlogs · 0 upvotes · 0 comments --- Tags: [#azure](https://daily.dev/tags/azure), [#rust](https://daily.dev/tags/rust), [#authentication](https://daily.dev/tags/authentication), [#cosmos-db](https://daily.dev/tags/cosmos-db) [View this post on daily.dev](https://daily.dev/posts/azure-sdk-release-october-2026--ftfku6er9) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Azure SDK Release (October 2026)","url":"https://daily.dev/posts/azure-sdk-release-october-2026--ftfku6er9","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/azure-sdk-release-october-2026--ftfku6er9"},"datePublished":"2026-10-28T16:28:16.109Z","dateModified":"2026-10-28T16:35:06.628Z","description":"Azure Core 1.63.0 for .NET adds mTLS proof-of-possession support for client certificate authentication and fixes delays in DefaultAzureCredential when IMDS is...","image":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/aa5393b2729ed470161cd60f45e0ec02?_a=AQAEuop","thumbnailUrl":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/aa5393b2729ed470161cd60f45e0ec02?_a=AQAEuop","isAccessibleForFree":true,"articleSection":"DevBlogs","inLanguage":"en","publisher":{"@type":"Organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180}},"author":{"@type":"Organization","name":"DevBlogs","logo":"https://media.daily.dev/image/upload/t_logo,f_auto/v1/logos/8f68b453325f482ebeb73fb780092713","url":"https://daily.dev/sources/devblogs"},"commentCount":0,"discussionUrl":"https://daily.dev/posts/azure-sdk-release-october-2026--ftfku6er9","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":0},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":"azure,rust,authentication,cosmos-db","timeRequired":"PT2M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"DevBlogs","item":"https://daily.dev/sources/devblogs"},{"@type":"ListItem","position":3,"name":"Azure SDK Release (October 2026)"}]} {"@context":"https://schema.org","@type":"FAQPage","@id":"https://daily.dev/posts/azure-sdk-release-october-2026--ftfku6er9#faq","mainEntity":[{"@type":"Question","name":"How do I migrate from the Cosmos DB Rust preview SDK to the stable 1.0 release?","acceptedAnswer":{"@type":"Answer","text":"Rename the preview_dtx, preview_patch, and preview_opentelemetry feature flags to their unstable_ equivalents, and replace CosmosCredential::MasterKey with CosmosCredential::AccountKey. 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