Esx 4.1.0 error vCLI when configuration backup

Hi,

I have a Esx 4.1.0 Build 260247, when I try do configuration backup with the command vicfg-cfgbackup.pl --server <insert IP address of name of server here> -s <Where you want it saved to> in my PC with vCLI 4.1, but  I have a error:

'Operation not supported on this host'

I had tried with different parameters but it's the same error.

I had tried with vCLI 5.1 and vCLI 4.1.

The server a the port 22 open.

Note: I have servers Esx 5.1 and I can do the configuration backups.

Any ideas?

Thanks!