My set-up
Server: Subsonic 4.6 for RHEL on CentOS 6.2
Client: Subsonic 3.3 Motorola Photon running Android 2.3.4
I had this working perfectly for about two weeks. I was using it fine last night and this morning I got up and tried to open up a podcast on the phone and got an error which said "Didn't understand the reply. Please check server address." I restarted the server, then restarted the phone. Same error. I then uninstalled and removed all the cached music and artwork from the phone and reinstalled the client. Now I get that error when I try to connect to the demo server.
Thanks in advance for any advice!