We are seeing MQ error 2009 (host not available) during our high volume performance test. The MQ service is bundled with many service and operations.
Caused by: java.net.SocketException: Unrecognized Windows Sockets error: 0: recv failed
This is a network-level or OS-level socket issue.
Resolved in 9.5 and might have patches for some versions. Please refer DE155570.