Before assuming this is your issue, please review the other Windows 11 article first. There is a good chance that one will fix your problem before proceeding below.
https://ncedcc.zendesk.com/hc/en-us/articles/18227720828307-Windows-11-USB-help
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Special Issues with Windows 11, JMRI, older PH-Pro, Ch340 serial port cable:
For some users, the Windows 11 built-in driver does not work for the older serial port cables that use the CH340 chipset. As a workaround, install the older Ch340 driver attached to this article.
This is the exact configuration I have tested and verified that works with a Windows 11 laptop and the older Ph-Pro serial port connections.
1. Windows 11 Home 23H2
2. Serial port driver: wch.cn driver dated 8-8-14 version 3.4.2014.8 using COM port 3
3. Java version: Azul Zulu JRE 11.70.15 (11.0.22) 64-bit https://www.azul.com/downloads/#zulu
4. Jmri Version 5.7.4 https://ncedcc.zendesk.com/hc/en-us/articles/27022400995731-JMRI-5-7-4-release
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