@dillu_dilsa, I cannot help you with your problem, but I would advise you if you can edit your title with something specific with your query. In that way, someone who can solve your problem can read it and post it here.
Friend your title is a bit misleading please update it.
Possible solution: Resetting your network or trying to reach same website with different IP. It happens when youre using a public network if not then check out devices on your network.