Got this from the guys at Ramble - worked for me
You'll need to configure your device for TCP access. Use the following
steps as a guide, although you may need additional, or different
1. Open Settings -> Options -> TCP or Options -> TCP
2. Enter the following information:
3. Open Settings -> Options -> Ramble IM
4. Make sure Network Conneciton reads 'Use Device TCP'
Now try to login to Ramble.