Wired connections connected properly but can’t open any site

Hi, today I tried to connect to the internet through my landline network and found that the network is connected but I am not able to view any websites. I tried checking the IP address. I found that to be correct and I also tried to confirm all the usernames and passwords that I use to connect to the internet and found that was also fine.
I am totally unaware on what to do next. Anybody up there to help me.
