Does LTPA token expiration prevent sending of SOAP response to standalone application

Question

I am using WebSphere 6.1 server.

In my application, we use web services for the communication of standalone client(Swing) with web part.

From web part, we use WebSphere MQ to communicate with the Pro*C part. When we trigger a button in client part, the web is called which in turn invokes the MQ for a response.

We face the below error when we do the above operation:

LTPAServerObj W   SECJ0371W: Validation of the LTPA token failed because the token expired with the following info: Token expiration Date: Thu Nov 20 07:56:12 CET 2014, current Date: Thu Nov 20 13:58:28 CET 2014.
SRTServletRes W   WARNING: Cannot set header. Response already committed.
LTPAServerObj W   SECJ0371W: Validation of the LTPA token failed because the token expired with the following info: Token expiration Date: Thu Nov 20 08:06:03 CET 2014, current Date: Thu Nov 20 14:01:36 CET 2014.

The MQ responses are OK as we trace the logs.

My Question: Does this LTPA token expiration prevent my websphere server from sending the SOAP response to client part?