Here i have shared the vmware vsphere vCenter log location , this will help you to troubleshoot and solve the problems.
vCenter 5.x / 6.x
The vCenter Server logs are placed in a different directory on disk depending on vCenter Server version and the deployed platform:
vCenter Server 5.x and earlier versions on Windows XP, 2000, 2003: %ALLUSERSPROFILE%Application DataVMwareVMware VirtualCenterLogs
vCenter Server 5.x and earlier versions on Windows Vista, 7, 2008: C:ProgramDataVMwareVMware VirtualCenterLogs
vCenter Server 5.x Linux Virtual Appliance: /var/log/vmware/vpx/
vCenter Server 5.x Linux Virtual Appliance UI: /var/log/vmware/vami
Note: If the service is running under a specific user, the logs may be located in the profile directory of that user instead of %ALLUSERSPROFILE%.