We can only enable PDM for single IP´s ; not entire Networks
1.Enable https [http server enable];
OBS: this command should be rewrited to "https server enable"
2.Create a PDM object [pdm location A.B.C.D netmask 255.255.255.255]
3.Permit to your IP access to PDM [ip http A.B.C.D netmask 255.255.255.255]