Sony will be shutting off the servers to some popular PS3 titles at the end of January 2019. Sony recently released this message:

“We wanted to update you on a planned service shut down, which impacts online access for Warhawk, Twisted Metal, PlayStation All-Stars: Battle Royale, and Sound Shapes. This has now been extended to January 31, 2019 at 12:00 AM PT.

Following this shutdown, Warhawk will no longer be playable unless the PS3 system is set to LAN mode for local network play. For Twisted Metal and PlayStation All-Stars: Battle Royale, users can play the campaign offline as well as local (couch) multiplayer in split screen mode. For Sound Shapes, users will be able to play the campaign and all DLC purchases as well as create their own levels, however, users won’t be able to share their levels with the community or download community created levels.”