If you’re unable to access Yahoo’s website (www.yahoo.com), try the following steps to resolve the issue:
Check your internet connection, cables, and routers to ensure they are functioning correctly.
Allow Google Chrome to access the network in your firewall or antivirus settings. If it’s already listed, remove it from the list and add it again.
If using a proxy server, disable it by going to Chrome settings > Show advanced settings > Change proxy settings > LAN Settings, then deselect “Use a proxy server for your LAN”.
Source: https://www.yahoo.com/news/teens-turn-weight-loss-drugs-110753607.html