Using Remoter 3.0.1 on iPad 2 and iPhone 4, both on iOS 5. Using Mac OS 10.7.2 on all computers involved. Just trying to connect on my LAN for now. Using VNC connection.
The thing is I have this set up on 3 other computers in the house and I am able to connect to each of them using Remoter.
Maybe relevant: This week I bought a new laptop for me and gave my old Macbook Pro to my son (replacing his Powerbook Pro in the process). The old Powerbook was reverted back to factory standards so all was erased. When setting up his new laptop I reassigned his DYNDNS address and setup my Airport Extreme (yes everything is behind a router) the same way I did with the other computers in the house. I thought I knew what I was doing but alas I cannot connect from either the iPad or iPhone. I am however able to connect from my laptop using Apple Remote Desktop.
Don't know if this is enough information to help me or if you need more. Please just ask and I will try to be more clear.