Set-VMHostSysLogServer for more than one log server

Hi Guys

I have difficulty to use Set-VMHostSysLogServer to set multiple log servers

Set-VMHostSysLogServer -SysLogServer 172.17.42.45:514 -vmhost esxhostname  is good.

but with

-SysLogServer 172.17.42.45:514,172.17.42.46:514

or

-SysLogServer tcp://172.17.42.45:514,tcp://172.17.42.46:514

always pops up error.

Any idea?

Thanks in advance.

Regards

Andy