An administrator has just installed a web server for the companys Internet site. After bringing the system online， customers notify the administrator that they cannot connect to the server. The administrator tests the web server from a workstation and can access the website. The customers continue to report issues. 
Which of the following is the MOST likely reason for this？（）

A. The servers firewall is misconfigured.
B. The server’s timeout feature is set incorrectly.
C. The web server was not installed properly.
D. The company firewall is misconfigured.