"Connection Reset" Error on accessing IIS 8.5 Server Site

I have create a very simple site in IIS Server version 8.5 using port 85. The site only have one index.html that shows the word "test" the page. When I access the site inside the server I can access it successfully: "http://localhost:85" is working.

Trial 1: I try accessing it from my computer that is connected to the same network with the server using url "http://servername.test.com:85", the browser goes loading for long time and finally ends in with error "Connection Reset".

Trial 2: I try updating the Site Binding's Host name with our "Vanity Name" and "IP Address", but after this I still get a "Connection Reset" error.

Trial 3: Now I also check for opened ports using netstat, and I can see that port 85 is open. So I don't know why I'm getting Connection Reset error

Trial 4: I added Connection timeout value on the settings. But still I'm getting Connection Reset error.

Please kindly help with advise how to fix this Connection Reset issue. I can't find what is the reason behind this issue. Thank you in advance.

I've found the solution. I issue was caused by Firewall enabled on the server and the ports are not opened by the Network Administrators. So I just opened the Ports that I will be using and it works now. Installing IIS Failure Tracing help me catch the error also. Thank you for all those who answered.