The SQL Server CSS (technical support) and Content teams have been publishing documentation on troubleshooting SQL Server networking issues.
Here is a list of articles that have been produced over the past few months.
Much of the content for these articles was the work of Malcolm Stewart – a tenured SQL Networking Escalation Engineer who has left a large legacy of documentation and troubleshooting tools in the SQL networking domain. Also, the following individuals contributed many hours of reviews, ideas, improvements, and content creation and organization: Pradeep Madheshiya, Padma Jayaraman, Seven Dong, Haiying Yu, and Joseph Pilov.