LPB632cdw - ethernet port not working, wifi is

[therealex]

My LPB632cdw ethernet port suddenly stopped working.  I changed the cable, connected it to a known good port on the switch.  I went into Network Settings and made sure it was set for Wired Lan.  Still, no connectivity.  It was JUST WORKING three days ago.  Nothing has changed.

I ended up switching to WiFi, which works.  But I'd rather have it wired.  Is there a way to test the ethernet port internally, maybe with a loopback?  Does the printer have that kind of troubleshooting utility built in?  This is pretty confusing.  Of course, I also cycled it a few times.  I could do a factory reset, but would prefer not to if it won't help (and I don't see why it would).

Thank you.  I know this is one of those "I never heard this before" problems.  Welcome to my world...😁

[DerrickL]

If your Canon LBP632Cdw Ethernet port fails while Wi-Fi works, it is likely a network priority conflict or a, power-save setting, or a faulty physical port. Force the printer to prioritize wired by setting it to "Wired LAN" only, power cycle the router, or assign a static IP

[donaldolsen]

If wifi is working well it is probably the LAN port that has issues, or link negotiation is falling. You can try to set switch port to 100Mbos/full duplex directly rather than auto, prior to factory reset.

[Stephen · Accepted solution]

Hi there! It's definitely frustrating when a port that was working perfectly just goes dark on you, especially when you've already done the standard "cable and switch" dance.

Since you've already confirmed it's set to Wired LAN, here are a few deeper dives into the official settings that might help you avoid a factory reset:

1. Check the "Internal" Health (User Data List)

To answer your question about testing the port internally, the best "diagnostic" is printing the User Data List.

• Path: Menu > Output Reports > User Data List.

• What to look for: Find the MAC Address under the Wired LAN section. If it shows a valid address (not all zeros), the hardware is likely fine, and we're looking at a communication or handshake issue.

2. Manual Speed Negotiation

Sometimes the "Auto Detect" handshake between the printer and the switch fails. You can force the printer to "wake up" the port by setting a manual speed.

• Path: Menu > Preferences > Network > Ethernet Driver Settings.

• Action: Change Auto Detect to Off and manually select 100BASE-TX Full Duplex.

3. Adjust the Startup Wait Time

If you’re on a managed switch, the printer might be timing out before the switch finishes its security checks (like Spanning Tree).

• Path: Menu > Preferences > Network > Wait Time for Connection at Startup.

• Action: Increase this to 60 seconds and restart. This gives the hardware a much longer window to establish that physical link.

4. Direct Connection Test

If the above fails, try a direct "peer-to-peer" connection. Plug an Ethernet cable directly from a laptop to the printer (bypassing the switch). If the link lights on the printer's port blink, then the port is alive, and the issue is a specific conflict with your switch.

If you don't see any activity lights after those steps, it might be time for a quick 1-on-1 with our technical team at 1-800-OK-CANON to see if the NIC itself needs a look.

Keep us posted on what that User Data List shows!

Official Resources:

• Wired LAN Setup Guide

• Network Settings Menu Guide

[therealex]

Yes, that was what I had before.  The answer was, apparently, the auto detect.  Once I set it to "off" and selected 100Base TX, it came to life!  Thanks for replying.

[therealex]

Yup, it was the auto Detect.  Once I turned it off and chose 100Base TX (no full duplex option), it came to life.  I assigned it a static IP, and it's good!  Thanks very much.