With db2 sqoop connections, always show

The ERROR manager. SqlManager: ERROR executing statement: com.. IBM db2. The JCC. Am. DisconnectNonTransientConnectionException: [JCC] [t4] [2043] [11550] [4.21.29] Exception java.net.NoRouteToHostException: ERROR opening the socket to the server/192.168.18.21 on port 50000 with message: No route to host. ERRORCODE=- 4499, SQLSTATE=08001

No route to host. ERRORCODE=- 4499, SQLSTATE=08001
This is exactly what for?
Have any DB2 great god to give directions, thank you!