RedHat security

[Larry D Sorensen]

I recently installed RedHat Workstation 3 on 2 different servers using
medium security. Both boxes are internal, (so I question why I used
medium), but I am now having trouble with the 2 databases on them
talking. I believe it to be a security issue, but I am not sure. What
steps would I have to go through, short if reinstalling, to make the
security how it would be if it were low?

Larry