Port forwarding in with dd.wrt

hi again didnt know where to put this so here i am,I have flashed my TP-LINK router with dd-wrt and all looks ok but it wont save my ports i set for forwarding also my wireless security settings, When i reboot the router they are blank again i have been messing with it all day and i'm getting know help from the forum that told me to flash my router with there software.
thanks

hi again it won't reflash ether i give up on that one so i when and brought me a new belkin Play N450 DB and that had better settings on for my VPN/PPTP that still won't work, I setup all my ports and everything works apart from my box, it will work but for only 10secs if i reboot the router, all the setting look the same as my old belkin router and that works fine,My mates box works ok its junt mine thats plugged in to the router,Forgot to say i have a dm500 as server at the moment and i use a ET9000 for viewing.
thanks

just watch tv off my et9000 off my dm500 server mate,I did get it working with the internal server ip but i was using a no ip address,I would still like to know what the reason is,i disabled all firewalls.
thanks