I'm having reliability issues with BES/BIS transport and wanted to try using TCP transport with various applications. However this never works for application I've loaded on my phone (but does work fine using the phone as a modem with the "internet/web/web" APN/user/pass).
For example, if I configure TwitterBerry with the TCP connection mode and then press "Test Connection" it always fails. The same happens with MidpSSH. On a collegues BB that is on the same contract, network and BES this works fine. The only difference I can see is that his phone is firmware 22.214.171.124. His phone doesn't have any service books that I don't have and his "Advanced Options/TCP" APN settings are blank (I've tried blank and internet/web/web).
Any advice really appreciated. Could this be a bug in the later firmware?