Alright, I've made some progress. I'm trying to start with 10g XE and work my way up. I installed 10g XE on our server, and from the server, I can run "CONNECT USERemail@example.com:1522/XE" and it will connect just fine. However, when I run the same connect command from a remote computer, it waits a little bit and gives me ORA-12170: TNS:Connect timeout occurred
Any thoughts on what I should look at to resolve this issue?