Problem with Pokemon Platinum WiFi

ok i cant go online on the GTS in Pokemon Platinum on my R4, also when i try to connect to some friends on Pokemon, it doesnt connect and kicks the person trying to connect offline. help is needed

https://www.romulation.org/forum/index.php?topic=1462.0

Replying to #2

ok when i connect with any pokemon game(not just roms) it wont connect but with any other DS game i have no problems connecting with other people. any advice(the router i'm using is a Netgear router. it worked at the beginning but it doesnt work anymore)