19:26:42.980: [rtmp stream: 'test_stream'] Connecting to RTMP URL rtmp://live-atl.twitch.tv/app...
19:27:07.689: RTMPSockBuf_Fill, remote host closed connection
19:27:07.693: [rtmp stream: 'test_stream'] Connection to rtmp://live-atl.twitch.tv/app failed: -3
19:27:07.699: [rtmp stream: 'test_stream'] Connecting to RTMP URL rtmp://live-iad03.twitch.tv/app...
19:27:32.567: RTMPSockBuf_Fill, remote host closed connection
19:27:32.567: [rtmp stream: 'test_stream'] Connection to rtmp://live-iad03.twitch.tv/app failed: -3
19:27:32.570: [rtmp stream: 'test_stream'] Connecting to RTMP URL rtmp://live-iad05.twitch.tv/app...
19:27:57.379: RTMPSockBuf_Fill, remote host closed connection
19:27:57.379: [rtmp stream: 'test_stream'] Connection to rtmp://live-iad05.twitch.tv/app failed: -3
OBS cannot reach the selected Twitch server. Either you have the wrong stream key, or you don't have 2 factor authentication enabled in Twitch, or there is a problem with your computer's configuration that specifically is preventing you from reaching Twitch but not other services (firewall/antivirus).