Partially solved: I factory reset the tv, and now the time is set correctly.
I have no internet connection, although being connected to wifi, according to my tv. Netflix is working, youtube isn't, and I can browse curiosity stream, but not play anything.
After half an hour of problem shooting, it seems the problem lies with my date and time being set incorrectly.
When I go to settings, and then date and time, almost all options are greyed out. It is set to automatically use broadcast time, but I can't disable that. Because it is enabled, I can't set date and time.
How can I change the date and time to regain internet access?
EDIT:
Sorry for not sharing this important thing: My tv is a sony bravia KD-49XD7005
You really need to identify what type of TV you have (Make and model) for anyone to be able to help you.