What is the problem?
Works ok on 1.4.1. Just upgraded to 1.4.2 and stop to connect to printer.
What did you already try to solve it?
Tried reboot both octopi and printer and diff bitrate but not working.
Complete Logs
2020-08-06 16:04:58,442 - octoprint.util.comm - INFO - Changing monitoring state from "Offline" to "Detecting serial connection"
2020-08-06 16:04:58,453 - octoprint.util.comm - INFO - Serial detection: Performing autodetection with 7 port/baudrate candidates: /dev/ttyUSB0@38400, /dev/ttyUSB0@115200, /dev/ttyUSB0@250000, /dev/ttyUSB0@230400, /dev/ttyUSB0@57600, /dev/ttyUSB0@19200, /dev/ttyUSB0@9600
2020-08-06 16:04:58,454 - octoprint.util.comm - INFO - Serial detection: Trying port /dev/ttyUSB0, baudrate 38400
2020-08-06 16:04:58,457 - octoprint.util.comm - INFO - Connecting to port /dev/ttyUSB0, baudrate 38400
2020-08-06 16:04:58,540 - octoprint.util.comm - INFO - Serial detection: Handshake attempt #1 with timeout 2.0s
2020-08-06 16:04:58,545 - octoprint.util.comm - INFO - M110 detected, setting current line number to 0
2020-08-06 16:05:00,143 - tornado.access - WARNING - 409 GET /api/printer (::ffff:192.168.2.44) 13.00ms
2020-08-06 16:05:00,558 - octoprint.util.comm - INFO - Serial detection: Handshake attempt #2 with timeout 2.0s
2020-08-06 16:05:00,562 - octoprint.util.comm - INFO - M110 detected, setting current line number to 0
2020-08-06 16:05:02,144 - tornado.access - WARNING - 409 GET /api/printer (::ffff:192.168.2.44) 13.22ms
2020-08-06 16:05:02,565 - octoprint.util.comm - INFO - Serial detection: Handshake attempt #3 with timeout 2.0s
2020-08-06 16:05:02,572 - octoprint.util.comm - INFO - M110 detected, setting current line number to 0
2020-08-06 16:05:04,147 - tornado.access - WARNING - 409 GET /api/printer (::ffff:192.168.2.44) 11.91ms
2020-08-06 16:05:04,579 - octoprint.util.comm - INFO - Serial detection: Trying port /dev/ttyUSB0, baudrate 115200
2020-08-06 16:05:04,589 - octoprint.util.comm - INFO - Serial detection: Handshake attempt #1 with timeout 2.0s
2020-08-06 16:05:04,600 - octoprint.util.comm - INFO - M110 detected, setting current line number to 0
2020-08-06 16:05:06,143 - tornado.access - WARNING - 409 GET /api/printer (::ffff:192.168.2.44) 13.50ms
2020-08-06 16:05:06,600 - octoprint.util.comm - INFO - Serial detection: Handshake attempt #2 with timeout 2.0s
2020-08-06 16:05:06,607 - octoprint.util.comm - INFO - M110 detected, setting current line number to 0
2020-08-06 16:05:08,148 - tornado.access - WARNING - 409 GET /api/printer (::ffff:192.168.2.44) 11.97ms
2020-08-06 16:05:08,609 - octoprint.util.comm - INFO - Serial detection: Handshake attempt #3 with timeout 2.0s
2020-08-06 16:05:08,621 - octoprint.util.comm - INFO - M110 detected, setting current line number to 0
2020-08-06 16:05:10,144 - tornado.access - WARNING - 409 GET /api/printer (::ffff:192.168.2.44) 12.86ms
2020-08-06 16:05:10,621 - octoprint.util.comm - INFO - Serial detection: Trying port /dev/ttyUSB0, baudrate 250000
2020-08-06 16:05:10,630 - octoprint.util.comm - INFO - Serial detection: Handshake attempt #1 with timeout 2.0s
2020-08-06 16:05:10,642 - octoprint.util.comm - INFO - M110 detected, setting current line number to 0
2020-08-06 16:05:12,145 - tornado.access - WARNING - 409 GET /api/printer (::ffff:192.168.2.44) 13.14ms
2020-08-06 16:05:12,648 - octoprint.util.comm - INFO - Serial detection: Handshake attempt #2 with timeout 2.0s
2020-08-06 16:05:12,662 - octoprint.util.comm - INFO - M110 detected, setting current line number to 0
2020-08-06 16:05:14,149 - tornado.access - WARNING - 409 GET /api/printer (::ffff:192.168.2.44) 12.15ms
2020-08-06 16:05:14,666 - octoprint.util.comm - INFO - Serial detection: Handshake attempt #3 with timeout 2.0s
2020-08-06 16:05:14,685 - octoprint.util.comm - INFO - M110 detected, setting current line number to 0
2020-08-06 16:05:16,154 - tornado.access - WARNING - 409 GET /api/printer (::ffff:192.168.2.44) 19.78ms
2020-08-06 16:05:16,681 - octoprint.util.comm - INFO - Serial detection: Trying port /dev/ttyUSB0, baudrate 230400
2020-08-06 16:05:16,687 - octoprint.util.comm - INFO - Serial detection: Handshake attempt #1 with timeout 2.0s
2020-08-06 16:05:16,701 - octoprint.util.comm - INFO - M110 detected, setting current line number to 0
2020-08-06 16:05:18,149 - tornado.access - WARNING - 409 GET /api/printer (::ffff:192.168.2.44) 12.01ms
2020-08-06 16:05:18,704 - octoprint.util.comm - INFO - Serial detection: Handshake attempt #2 with timeout 2.0s
2020-08-06 16:05:18,716 - octoprint.util.comm - INFO - M110 detected, setting current line number to 0
2020-08-06 16:05:20,145 - tornado.access - WARNING - 409 GET /api/printer (::ffff:192.168.2.44) 14.27ms
2020-08-06 16:05:20,717 - octoprint.util.comm - INFO - Serial detection: Handshake attempt #3 with timeout 2.0s
2020-08-06 16:05:20,732 - octoprint.util.comm - INFO - M110 detected, setting current line number to 0
2020-08-06 16:05:22,148 - tornado.access - WARNING - 409 GET /api/printer (::ffff:192.168.2.44) 15.31ms
2020-08-06 16:05:22,734 - octoprint.util.comm - INFO - Serial detection: Trying port /dev/ttyUSB0, baudrate 57600
2020-08-06 16:05:22,749 - octoprint.util.comm - INFO - Serial detection: Handshake attempt #1 with timeout 2.0s
2020-08-06 16:05:22,756 - octoprint.util.comm - INFO - M110 detected, setting current line number to 0
2020-08-06 16:05:24,146 - tornado.access - WARNING - 409 GET /api/printer (::ffff:192.168.2.44) 13.27ms
2020-08-06 16:05:24,758 - octoprint.util.comm - INFO - Serial detection: Handshake attempt #2 with timeout 2.0s
2020-08-06 16:05:24,764 - octoprint.util.comm - INFO - M110 detected, setting current line number to 0
2020-08-06 16:05:26,145 - tornado.access - WARNING - 409 GET /api/printer (::ffff:192.168.2.44) 13.89ms
2020-08-06 16:05:26,767 - octoprint.util.comm - INFO - Serial detection: Handshake attempt #3 with timeout 2.0s
2020-08-06 16:05:26,780 - octoprint.util.comm - INFO - M110 detected, setting current line number to 0
2020-08-06 16:05:28,146 - tornado.access - WARNING - 409 GET /api/printer (::ffff:192.168.2.44) 13.67ms
2020-08-06 16:05:28,783 - octoprint.util.comm - INFO - Serial detection: Trying port /dev/ttyUSB0, baudrate 19200
2020-08-06 16:05:28,798 - octoprint.util.comm - INFO - Serial detection: Handshake attempt #1 with timeout 2.0s
2020-08-06 16:05:28,805 - octoprint.util.comm - INFO - M110 detected, setting current line number to 0
2020-08-06 16:05:30,145 - tornado.access - WARNING - 409 GET /api/printer (::ffff:192.168.2.44) 13.28ms
2020-08-06 16:05:30,805 - octoprint.util.comm - INFO - Serial detection: Handshake attempt #2 with timeout 2.0s
2020-08-06 16:05:30,811 - octoprint.util.comm - INFO - M110 detected, setting current line number to 0
2020-08-06 16:05:32,153 - tornado.access - WARNING - 409 GET /api/printer (::ffff:192.168.2.44) 13.20ms
2020-08-06 16:05:32,818 - octoprint.util.comm - INFO - Serial detection: Handshake attempt #3 with timeout 2.0s
2020-08-06 16:05:32,830 - octoprint.util.comm - INFO - M110 detected, setting current line number to 0
2020-08-06 16:05:34,152 - tornado.access - WARNING - 409 GET /api/printer (::ffff:192.168.2.44) 13.07ms
2020-08-06 16:05:34,832 - octoprint.util.comm - INFO - Serial detection: Trying port /dev/ttyUSB0, baudrate 9600
2020-08-06 16:05:34,837 - octoprint.util.comm - INFO - Serial detection: Handshake attempt #1 with timeout 2.0s
2020-08-06 16:05:34,854 - octoprint.util.comm - INFO - M110 detected, setting current line number to 0
2020-08-06 16:05:36,148 - tornado.access - WARNING - 409 GET /api/printer (::ffff:192.168.2.44) 15.25ms
2020-08-06 16:05:36,861 - octoprint.util.comm - INFO - Serial detection: Handshake attempt #2 with timeout 2.0s
2020-08-06 16:05:36,872 - octoprint.util.comm - INFO - M110 detected, setting current line number to 0
2020-08-06 16:05:38,154 - tornado.access - WARNING - 409 GET /api/printer (::ffff:192.168.2.44) 14.57ms
2020-08-06 16:05:38,874 - octoprint.util.comm - INFO - Serial detection: Handshake attempt #3 with timeout 2.0s
2020-08-06 16:05:38,888 - octoprint.util.comm - INFO - M110 detected, setting current line number to 0
2020-08-06 16:05:40,153 - tornado.access - WARNING - 409 GET /api/printer (::ffff:192.168.2.44) 14.67ms
2020-08-06 16:05:40,891 - octoprint.util.comm - INFO - Changing monitoring state from "Detecting serial connection" to "Error: No more candidates to test, and no working port/baudrate combination detected."
2020-08-06 16:05:40,921 - octoprint.plugins.excluderegion - INFO - Printing stopped: event=Error
2020-08-06 16:05:40,926 - octoprint.util.comm - INFO - Changing monitoring state from "Error: No more candidates to test, and no working port/baudrate combination detected." to "Offline (Error: No more candidates to test, and no working port/baudrate combination detected.)"
2020-08-06 16:05:40,942 - octoprint.plugins.action_command_notification - INFO -
WRITE HERE
Additional information about your setup
Marlin 2.0.5, CR-10 v2
WRITE HERE