Cannot ping some computers over the network ?



We have about 230 computers on our network, all computers have "Computer Protection" installed.  We use same f-secure profiles on all computers, and we use f-secure built-in firewall. Windows own firewall is disabled. 


The problem is we cannot ping a lot of our computers, even if they are online. So I did a test and uninstalled F-secure on one of the computer that I couldn't ping. Voila! It`s pingable again. 


So the question is, why does many computers works perfect with F-secure and I can ping them, and a lot of others computers is not pingable. It`s the same f-scure profile on the clients. Workaround ?


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