The scenario is as follows: there is a LAN with a given number of PCs connected. PC1 is directly connected to internet through a modem attached to ethernet adapter 0. A hub is attached to eth1. Every other PC in the net is attached to the hub. PC1 use ICS to share the internet conection. Now, PC2 host a service at a forwarded port. It is known that people from the outside can connect to this service. However, computers from inside the LAN cannot. Is there any way to solve this? Is MS Loopback Adapter usful in any way?

Can these computer at least ping each ohter , are they on the same subnet ??

check your firewall configuration Golly gee wilerkers everyone. Learn to Internet Search

Alaa: they are in the same subnet and they can ping eachother as long as i ping to the local address wanderer: i forget to say. firewall is disabled in both PC1 and PC2.

i think in the firs message i didn't said clearly how they are connecting to the service. Well, the client application tries to connect to the global ip at the service port. i think that is way it is not working. i'm currently finishing a workaround, redirecting call to connect API and modifying parameters, but i'd prefer a better, and more elegant solution.