set syslog settings
# Conncect to vCenter Server/Host
Connect-VIServer -Server a.b.c.d -user username -password password
Get-VMHostAdvancedConfiguration -name Syslog.Remote.Hostname -VMhost fqdn
Set-VMHostAdvancedConfiguration -name Syslog.Remote.Hostname IP-ADRESSE -VMhost fqdn
# show syslog settings
Get-VMHost ESXHostnameOrIP | Get-VMHostSysLogServer
# set syslog settings
Get-VMHost ESXHostnameOrIP | Set-VMHostSysLogServer -SysLogServer SyslogHostnameOrIP -SysLogServerPort PortNumber
# for hosts added by Connect-VIServer
Get-VMHost | Set-VMHostSysLogServer -SysLogServer a.b.c.d -SysLogServerPort 514