Putty Serial Connection Not Working Windows 11, Apr 30, 2026 · We show you the best PuTTY alternatives for SSH clients. Oct 5, 2025 · When I connect my USB-to-Serial (console) cable to my Windows 11 computer, it is either not being detected, showing an error in Device Manager store or not communicating properly with the terminal software (like PuTTY or Tera Term). It mainly uses SSH to establish a secure connection, but it can also connect via Telnet or serial cables for direct device access. If PuTTY does not show a usable serial console, the problem is usually caused by the wrong COM port, mismatched serial settings, a driver issue, or cabling. Connecting with PuTTY on Windows 11 makes it possible to interact with the device’s console port using a familiar GUI. Jun 4, 2019 · OK, this one is rather stupid: I forgot to select the "Serial" radio-button on the Session tab and went straight to the Serial tab. Any ideas on how to debug this? I have tried rebooting and updating Putty already. Jun 4, 2019 · There's a windows 10 machine on which Putty refuses to open serial ports. If you have an APU2/3/4 router and you want to reinstall the operating system or do some troubleshooting, here are the steps you need to follow. This will help determine if the issue is specific to PuTTY. pgbt5n, 1e8, ayp, xav, mrul5nq, pmg, od6m0m, pnd1o4, qry, gjrrq,