This is a pointer to a blog I wrote for the AskPFEPlat TechNet blog (http://blogs.technet.com/b/askpfeplat/) covering pretty much EVERYTHING UNDER THE SKY in relation to MCA (or MaxConcurrentAPI). This just happens to be one of my areas of sick passion, and the blog pulls together my personal experience along with information from multiple locations online from TechNet, blogs, and support articles.
WHERE CAN I FIND THIS SUPER COOL RESOURCE?
Please see the following link to view the full blog: http://blogs.technet.com/b/askpfeplat/archive/2014/01/13/quick-reference-troubleshooting-diagnosing-and-tuning-maxconcurrentapi-issues.aspx
For your ease of access to specific sections, you can also use the below TOC to jump to anyplace on the blog!
WHAT'S COVERED IN THE BLOG?
What is MaxConcurrentAPI anyway?
What are some of the symptoms of MCA?
How do I detect a MCA issue?
Netlogon performance counters
How do I change the value of MaxConcurrentAPI?
How do I tune MCA?