Connection from a Windows Service could be blocked by firewall even if firewall is disabled

Recently, I worked on a customer issue. The customer encountered an “error: 26 – Error Locating Server/Instance Specified” error  although he has applied/verified every steps I posted in the blog:http://www.bing.com/search?q=error+26+blog+protocol&form=QBRE&qs=n After some investigation, we found that: Windows Firewall is disabled on both server and client machine. Running Portqry from a command window also show that…