How Do I Effectively Block an IP Address on My Network? or What's the Best Way to Block an IP Address

Router blocks can be flaky. Have you tried blocking the IP in your host file? On Windows, it’s at C:\Windows\System32\drivers\etc\hosts. Just add the IP and point it to 0.0.0.0.

Not as elegant as a firewall, but it’s a quick fix. Just remember to run Notepad as admin when editing!