Hello i'm a GM and i use l2net, but gm Commands dont work

Can someone help?

you are Admin ? no? maybe Admin off comands for GM :)

You can try asking at the Authors forums. www.ltwonet.com .

GM commands do not work via the L2Net console, thus you can't use OOG if that is what you tried.  If you use L2Net IG version, you can use gm commands via the L2 client itself just fine.