Hello and welcome to the forum! try to follow this steps below and please, let us know if its working for you or you still have problems... For linux: Try this from a terminal: ifconfigYour MAC address is the one after HWaddr. If it is 00:00:00:00:00:00 I think something is wrong with either the hardware or the driver. If you somehow erased your MAC-address from the network settings you can get it back by writing this in the terminal: sudo lshw > lshw.txt write password when prompted for it this takes approximately 20 seconds. gedit lshw.txt Now you are looking at a list of all your hardware. But we only want the networking specs. Do a search for "network". A couple of lines under that line, there should be a line like this: serial: 01:21:ee:de:01:11Only your numbers will be different. This is the MAC-address. Copy that address, and paste it into the network settings. Then you should have restored your original MAC-address. for windows users: 1. click on start and type cmd (or run command promt as Administrator) 2. type command: ipconfig /all 3. try to search for line with name of your network device (should be smt like Intel® 82579LM Gigabit Network Connection and etc) and look at Physical Address (MAC) ... it must be smt like 6C-11-14-E2-BC-D8 (simply different then 00-00-00-00-00-00) 4. if you see that your MAC (physical address) is filled by zeros, try to update your network drivers (or chipset drivers). 5. if your MAC is correct and you still have problem in game, be sure that you not using any type of proxy! 6. if your problems persist, ask us, we can help you with specific SW that allowing to change your MAC ...and also try to check your et/etpub version (should be 2.6b) - i remember that old client was quite bugy sometimes...