Connection Problem

Having problems getting Octoprint to connect with the printer. When I hit connect, the printer restarts, goes through Sorting Files, to main Information screen but Octoprint says it can't connect. Log shows:

Changing monitoring state from "Offline" to "Detecting serial connection"
Performing autodetection with 7 port/baudrate candidates: /dev/ttyACM1@115200, /dev/ttyACM1@250000, /dev/ttyACM1@230400, /dev/ttyACM1@57600, /dev/ttyACM1@38400, /dev/ttyACM1@19200, /dev/ttyACM1@9600
Trying port /dev/ttyACM1, baudrate 115200
Connecting to port /dev/ttyACM1, baudrate 115200
Handshake attempt #1 with timeout 2.0s
Connected to: Serial<id=0x5fb2b630, open=True>(port='/dev/ttyACM1', baudrate=115200, bytesize=8, parity='N', stopbits=1, timeout=2.0, xonxoff=False, rtscts=False, dsrdtr=False), starting monitor
Send: N0 M110 N0125
Handshake attempt #2 with timeout 2.0s
Send: N0 M110 N0
125
Handshake attempt #3 with timeout 2.0s
Send: N0 M110 N0125
Trying port /dev/ttyACM1, baudrate 250000
Handshake attempt #1 with timeout 2.0s
Send: N0 M110 N0
125
Handshake attempt #2 with timeout 2.0s
Send: N0 M110 N0125
Handshake attempt #3 with timeout 2.0s
Send: N0 M110 N0
125
Trying port /dev/ttyACM1, baudrate 230400
Handshake attempt #1 with timeout 2.0s
Send: N0 M110 N0125
Handshake attempt #2 with timeout 2.0s
Send: N0 M110 N0
125
Handshake attempt #3 with timeout 2.0s
Send: N0 M110 N0125
Trying port /dev/ttyACM1, baudrate 57600
Handshake attempt #1 with timeout 2.0s
Send: N0 M110 N0
125
Handshake attempt #2 with timeout 2.0s
Send: N0 M110 N0125
Handshake attempt #3 with timeout 2.0s
Send: N0 M110 N0
125
Trying port /dev/ttyACM1, baudrate 38400
Handshake attempt #1 with timeout 2.0s
Send: N0 M110 N0125
Handshake attempt #2 with timeout 2.0s
Send: N0 M110 N0
125
Handshake attempt #3 with timeout 2.0s
Send: N0 M110 N0125
Trying port /dev/ttyACM1, baudrate 19200
Handshake attempt #1 with timeout 2.0s
Send: N0 M110 N0
125
Handshake attempt #2 with timeout 2.0s
Send: N0 M110 N0125
Handshake attempt #3 with timeout 2.0s
Send: N0 M110 N0
125
Trying port /dev/ttyACM1, baudrate 9600
Handshake attempt #1 with timeout 2.0s
Send: N0 M110 N0125
Handshake attempt #2 with timeout 2.0s
Send: N0 M110 N0
125
Handshake attempt #3 with timeout 2.0s
Send: N0 M110 N0*125
Changing monitoring state from "Detecting serial connection" to "Error: No more candidates to test, and no working port/baudrate combination detected."
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.)"
Connection closed, closing down monitor

Error message shows:State: Offline (Error: No more candidates to test, and no working port/baudrate combination detected.)

Any ideas? Windows 10, RPi 3+B, USB from RPi to printer, direct connection to my router port. .017 version of Octoprint. Thanks

What did you already try to solve it?
Changed router ports. Octoprint currently set at Auto Baud Rate Detect because my other option "/dev/ttyACM1" didn't work either.