hi again Jefro, and tahnks again for your answer!
As you say, i havent found the answer of why the original OS (ClearOS 6.2) Fails. I created some threads in their community forums (and also lot of people has the same issues that i do, and no answers or fixex yet. I have just created a thread there summarizing all the problems that im facing with the OS. Here
is the link if you are interested.
Regarding to the possibility of virtualizing some Firewall Ditribution like Endian and another distro for file sharing, using VMware or virtualbox on a CentOS BOX, i have done some research and they say that its NOT recommended, as the firewall will be running on a Virtual machine in the physical machine, which is less secure than the distro running on the VM. And the security of the whole BOX and therefore the network is as solid as the weakest part of the system, which in this case is the CentOS system that would be hosting the VM with the Firewall distribution.
So, other 2 possibilities came to my mind:
1) Sticking to ClearOS 5.2 which I was using prior to 6.2 version and worked great. But the problem with this is that that version has several years on the market, is a bit outdated and is based on RHEL 5, while the new version is way more updated, modern, faster and based on RHEL 6
2) Moving to Zentyal, which seems to be a nice distro too, but it doesnt finish to convince me... Maybe because its based on Ubuntu.
What do you think? Do I have another possibilities?
Thanks a lot in advance!