Hi,
the error message that you posted stops where it gets interessting.
The RACF adapter works by issuing TSO commands in a telnet 3270 session and parsing the output. The parser expected a READY prompt but it didn't show up within the timeout time.
If really nothing showed up maybe that means that something is really slow. I can't remember if there is a way to increase the timeout which might help in that case.
But i assume that there is something after the Text received:. If it is some code that starts with I then ask your RACF contact to look it up because then it is a RACF error code that has a documented meaning.
If it is a screen with mainframe panels then your login action is wrong and the adapter is stuck loging in.
Regards,
Patrick