Dedicated Server Fixes

I have just switched to a dedicated server and someone here set it up, is working properly with a few issues that need to be addressed. 1. I would like someone to check the server setting to make sure everything is setup the best and most secure it can be. 2. I am getting a 500 error when attempting to install prosper 202 3. I am having problems with name server and getting several of my sites from godaddy to find the server there server is CentOS with webmin set up. These should be pretty quick fixes. Mike