We have Windows server 2012 Datacenter VM hosted in windows ESXi v 5.1.0 1743533. We run globalscape FTP server on this guest OS. The problem with this particular VM is that the VM freezes/hangs time to time. When this happens we have not option but to reset it. When it freezes we can ping but cannot remote desktop to it, GlobalScape FTP stops responding to ftp client. We also observed that when this occurs the vmware tools stops working.
The ftp server is a production server and we are helpless that we don't have any option but to reset the VM. Its been recurring once or twice every week. Further information is below:
This VM runs in vnxnet3 vNIC, Windows system log show nothing significant err before VM freezes. We do take snapshot every Sunday to backup.