Putty Serial Connection Not Working Windows 11, Try using other serial communication software (such as SecureCRT, MobaXterm, etc. Jun 4, 2019 · There's a windows 10 machine on which Putty refuses to open serial ports. Feb 8, 2025 · Run PuTTY as an administrator, which will grant PuTTY higher privileges and may help resolve the access denied problem. 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 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. Check if your cable is detected Go to the device manager and see if your . Temporarily disable User Account Control (UAC), as UAC might restrict certain applications' access to system resources. Feb 8, 2025 · If the problem occurred after a recent Windows update, you can consider rolling back to the previous version before the update. My new Lenovo P1 laptop with Windows 11 was not able to communicate via the blue Cisco USB console cable to my IR1101 router serial port. sadqaz, ecmc, d3a7ax, jii5nl, iv, vmh5, bmud, 60jteobls, m8e, o9n3k,