iis and apache combination on real server for 403 - apache

Question

We have a win2003 server that run both IIS 7 and apache (using wamp server 2.2).
We put on both server a page named test.html that show us a message that say "You are on IIS page" and "You are on WAMP page" to show us if everything is working correctly.
Both running real great locally. IIS is listening on port 80 and apache on port 8082. The problems come remotly. Both services are running and wamp is fully online (green icon + "put online" option activate).
Locally, on the server, doing http://localhost/test.html and http://localhost:8082/test.html show the correct pages. If we replace localhost by real IP address (for example purpose, let say http://10.2.5.16/test.html and http://10.2.5.16:8082/test.html), still work. (not actual address but address used for real is the same used by dns web service)
Remotly, from any other PC, doing http://10.2.5.16/test.html and http://10.2.5.16:8082/test.html, the first give us the website normally, the second give us a HTTP 403 FORBIDEN (tried using both htaccess and windows permission, still have 403). The same way, using http://www.ourdomain.com/test.html and http://www.ourdomain.com:8082/test.html give us the exact same result (first ok, second 403)
Is it possible to make it work correctly?
Thanks in advance.
edit: Just to add to the solution :
the firewall was blocking me, add the wamp on this port allowed
in my configuration, i had in my directory statement Require local, which needed to be set to Require all granted
for the rest, the solution was pretty it.
Thanks again.

Answer 1

The fact that you can get to the sites locally tells me both servers are setup correctly and listening on respective ports.
Upon further questions, the OP indicated that the Servername Directive, is pointing to localhost and it should be changed as.
ServerName localhost:8082
To
ServerName example.com:8082 # or add "ServerAlias example.com:8082" to your existing.
Where as example.com is your site DNS. Then in your [System32\drivers\etc\hosts] point that DNS to the ip of your Remote host.
403 is happening because the request from the remote is not matched against any Servername or ServerAlias and it falls to the default handler which normally has stricket permissions. If you look closely in logs(/logs/apache/access.log), there should be something about "access denied by server configuration /somelocation like your default DocRoot"
If you make request for http://example.com and you have correct ip in your hostfile, you can trace what happens to that request in the remote host and where it ends up(firewalls, Apache etc). Apache is good at logging and you just need to find relevant log entries!