After update to 23.7.4 getting LOGIN FAILURES ON ttyU0

[poupin]

After update from 23.7.3 to 23.7.4 I'm getting within about each ~1 minutes following messages to system log:

2023-09-25T11:44:01
[Notice]
login   2 LOGIN FAILURES ON ttyU0, Scanned 4 Networks...
2023-09-25T11:43:47
[Notice]
login   2 LOGIN FAILURES ON ttyU0, Startup/Boot....
2023-09-25T11:39:01
[Notice]
login   2 LOGIN FAILURES ON ttyU0, Scanned 4 Networks...
2023-09-25T11:38:47
[Notice]
login   2 LOGIN FAILURES ON ttyU0, Startup/Boot....

Do you have idea what could be broken? How to mitigate such issue?

Thank you in advance for any hint, Martin

[axsdenied]

I believe those are console errors.  Do you have a serial connection or usb based serial connection connected to it?

[poupin]

Thank you for the hint!
it seems it was caused by connected ESP32 device (used for control of Somfy devices) which was connected to router via USB (but just for powering) and this was done same time as was performed the upgrade ;-).
It helps to have unchecked "Use USB-based serial ports" in System: Settings: Administration.