This site can't be reached error on multiple sites since I changed the wifi password

I got my new connection this morning, First thing I did was changing the password of the wifi, and then I tried the connection. Whenever I try to connect to sites like, twitch, github and other pages I get the screen “This site can’t be reached address took too long to respond...” also outlook and slack don’t get internet. I some how can see youtube videos and on http://mijnmodem.kpn/ after speed test I have a normal speed.