Here at my place of work, we are running some websites on Windows Server 2008R2 with IIS 7, and some others on Centos 6.5 with Apache. The problem that we are having is that none of these websites load on the internal network of a customer. I have checked our firewalls, and from what I can see, nothing is blocking their network from accessing our websites.
This only happening for this customer only. The websites load for everybody else.
I have some network background, but not at an intermediate/expert level. Can anyone of you tell me how to either find if the problem is on the network the serves are running on or not?