We have recently upgraded the server. We have windows service for getting messages from MQ server. After upgrading the server, we are having a problem while receiving bilk messages from IBM MQ Server. On every service run, it picks only one message. We have installed MQ Client Ver 8 and Windows Server 2012. It was working fine with MQ Client Ver 7 and Windows Server 2003 but the same is not working with new server. Code snippet is attached for reference.