#1 after sending file in msn, messages can not send back again

[tower]

After sending a file to the requester, The mrobot can not send message to the request any more. According to the logs information, the mrobot can receive the messages, but can not feed back again. It seems the chat session is lost, not sure. This happens when in msn im network.

Env:
msn client module + gbook mp module

Repeat Steps:
in msn client GUI, send these commands:
1. hello
2. search:snmp
3. download:434
Note:
the GUI client will receive the file from the mrobot sucessfully, but after tha,t the GUI client can not receive any message bouncing back from any command.