Cannot add cable between patch panels -"All mid-span terminations must all be attached to the same device" #1079

New Issue

MrUnknownDE · 2026-04-05T20:21:24+02:00

MrUnknownDE commented

2026-04-05 20:21:24 +02:00

Originally created by @JCrabtree911 on 10/13/2025

NetBox Edition

NetBox Community

NetBox Version

V4.4.1

Python Version

3.12

Steps to Reproduce

Create a device with a dcim.consoleport
Create a patch panel - PP1.01 - with dcim.frontports mapped 1:1 to dcim.rearports
Create a patch panel - PX1.01 - with dcim.frontports mapped 1:1 to dcim.rearports
Create serial patch panel - SP1.01 - with dcim.frontports mapped 1:1 to dcim.rearports
Create cable which terminates 8 of the rear ports on SP1.01 to a single dcim.consoleserverport
(black breakout cable)
create a cable which terminates 1 rear port on PP1.01 to 1 rear port on PX1.01
(green cable)
create a cable which terminates the dcim.consoleport to one dcim.frontport on PP1.01
(red)
Attempt to create a cable which connects a dcim.frontport of PX1.01 to a dcim.frontport of SP1.01 THIS WILL FAIL
(PINK)

The cable run, in terms of port types, should be

dcim.consoleport -> dcim.frontport -> dcim.rearport -> dcim.rearport -> dcim.frontport -> dcim.frontport -> dcim.rearport -> dcim.consoleserverport

Expected Behavior

The expected behavior is that I have a complete cable run (span) from a console port to a console server port.

Observed Behavior

I initially attempted this via the REST API and it only returned a '500 Internal Server Error' without details. I then tried to add this cable manually via the usual web interface and received the error message "All mid-span terminations must all be attached to the same device"

I searched for that error message and found 1 bug report for a 3.x release (and 4.02) which doesn't relate to this type of connection. It's not clear from this error message what the problem even is. There is only 1 device connected to each end of every cable in the span. Some further testing revealed the problem to be the breakout cable. This is a common scenario where a device has a breakout port connected to a patch panel and should be supported, or should, at least, return a more useful error message

*Originally created by @JCrabtree911 on 10/13/2025* ### NetBox Edition NetBox Community ### NetBox Version V4.4.1 ### Python Version 3.12 ### Steps to Reproduce 1. Create a device with a dcim.consoleport 2. Create a patch panel - PP1.01 - with dcim.frontports mapped 1:1 to dcim.rearports 3. Create a patch panel - PX1.01 - with dcim.frontports mapped 1:1 to dcim.rearports 4. Create serial patch panel - SP1.01 - with dcim.frontports mapped 1:1 to dcim.rearports 5. Create cable which terminates 8 of the rear ports on SP1.01 to a single dcim.consoleserverport (black breakout cable) 6. create a cable which terminates 1 rear port on PP1.01 to 1 rear port on PX1.01 (green cable) 7. create a cable which terminates the dcim.consoleport to one dcim.frontport on PP1.01 (red) 8. Attempt to create a cable which connects a dcim.frontport of PX1.01 to a dcim.frontport of SP1.01 **THIS WILL FAIL** (PINK) The cable run, in terms of port types, should be dcim.consoleport -> dcim.frontport -> dcim.rearport -> dcim.rearport -> dcim.frontport -> dcim.frontport -> dcim.rearport -> dcim.consoleserverport <img width="1300" height="750" alt="Image" src="https://github.com/user-attachments/assets/16f72c45-74d0-4360-a7d5-74a7950a13b4" /> ### Expected Behavior The expected behavior is that I have a complete cable run (span) from a console port to a console server port. ### Observed Behavior I initially attempted this via the REST API and it only returned a '500 Internal Server Error' without details. I then tried to add this cable manually via the usual web interface and received the error message _"All mid-span terminations must all be attached to the same device"_ I searched for that error message and found 1 bug report for a 3.x release (and 4.02) which doesn't relate to this type of connection. It's not clear from this error message what the problem even is. There **is** only 1 device connected to each end of every cable in the span. Some further testing revealed the problem to be the breakout cable. This is a common scenario where a device has a breakout port connected to a patch panel and should be supported, or should, at least, return a more useful error message

MrUnknownDE closed this issue

2026-04-05 20:21:25 +02:00

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Reference: github/netbox#1079