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On DD-WRT firmware, you can either:
- enter "playstation.net" (without quotes, and no wildcard needed) under block by URL, or
- enter "playstation" (without quotes) under block by keyword
Under "block services", click add/edit and create these, give them names, and enable them:
The UPD ports are used by PSN. TCP 443 is https... of course, this means you won't be able to access anything HTTPS, such as a secure website... but I can't think of any other way to block the playstation.net https addresses, since that won't work with the block by url/keyword function.