Couchbase .NET SDK version 2.3.5 introduces several enhancements and bug fixes, focusing on improved security and compatibility with future .NET Core releases. A significant update includes the implementation of SCRAM-SHA1, a more secure authentication mechanism that enhances password hashing without requiring configuration changes from users. The release also sets groundwork for .NET Core support by addressing specific compatibility issues with socket connections, SSL streams, and asynchronous calls under NUnit 3. Additionally, N1QL Query Timing is introduced to aid in diagnosing network issues, while SDK convergence efforts aim to maintain consistency across different programming models. The release notes highlight various fixes and improvements, underscoring the commitment to enhancing the developer experience and preparing for a forthcoming developer preview of the Couchbase .NET Core SDK.