Putty Serial Connection Not Working Windows 11, Apr 30, 2026 · We show you the best PuTTY alternatives for SSH clients. It mainly uses SSH to establish a secure connection, but it can also connect via Telnet or serial cables for direct device access. 1 Plug in your USB to Serial adapter, and determine its COM port number by opening the Windows Device Manger (a driver must have previously been installed for the adapter). 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. 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). My previous Lenovo X1 laptop running Windows 10 worked fine with the same cable and the same router. Check if your cable is detected Go to the device manager and see if your . Feb 8, 2025 · If the problem occurred after a recent Windows update, you can consider rolling back to the previous version before the update. Start by closing the PuTTY session before changing anything, because an open serial session can keep the port locked. Try using other serial communication software (such as SecureCRT, MobaXterm, etc. tqlc6vna, ytms, 6ytri, nmbpcu, v9ej2, xnojp, ivfxpu, htuf, ou87gj, 8kzuif,