disconnecting on logon request

here us the scenario,

our customer is sending us some messages continously, but when application using quickfix sends a logon request it disconnects on receiving some other message

20090203-08:45:27.481: Initiated logon request
20090203-08:45:27.501: quickfix.SessionException Logon state is not valid for message (MsgType=6)
20090203-08:45:27.501: Disconnecting
20090203-08:45:27.514: Failed to verify message: 8=FIX.4.0^A9=113^A35=6^A34=2601972^A49=S005^A52=20090203-08:44:00^A56=R005^A23=XLAX:5:1224729204606970^A
27=0^A38=500^A44=7.88^A54=2^A55=UCBH^A10=055^A

1) Do you know why is it disconnecting and not waiting for logon response?
2) Do we have some way to enable detailed logging in quickfix, it looks very difficult to debug things with very little info in the log. (Disconnecing : Its not clear whois disconnecting we or the customer.). Is there any way to classify the in/out messages?