I am a Co-Founder of CloudAtCost.
This might be misread and I think the support person was trying to say that they don't support the configuration of SELinux and that they are responsible for the operation of the server from a hardware level and any changes you perform in your guest OS us up to the you to maintain.
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Best posts made by gcamacho
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RE: CloudatCost Doesn't Fully Support CentOS SELinux