I have set up a Linux server in DMZ. There is another Windows server running in same DMZ. These two servers can be pinged via internet using my home PC. However, the another Linux server rented from a hosting service provider can only be pinged from the Windows Server and not from the Linux server (accessed via internet). So the situation is: Windows server (DMZ) ---ping--- Rented Server.....Successful Linux server (DMZ) ---ping--- Rented Server.......Unreachable Home PC ---ping--- Linux server (DMZ).......Successful Home PC ---ping--- Windows server (DMZ).....Successful When I ran tcpdump on my Linux Server(DMZ) and started ping from Rented Server, it showed that the Linux Server(DMZ) is receiving ping and replying. There is no restriction defined in hosts.deny and hosts.allow file that might cause this problem. What else should I check to get this working?