Putty Serial Connection Not Working Windows 11, 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. My previous Lenovo X1 laptop running Windows 10 worked fine with the same cable and the same router. Feb 8, 2025 · Run PuTTY as an administrator, which will grant PuTTY higher privileges and may help resolve the access denied problem. May 1, 2026 · Sign into PuTTY, set Connection type to Serial, then fill Serial line with the correct COM port (like COM1 or COM3) and choose the baud rate plus parity and flow control. Any ideas on how to debug this? I have tried rebooting and updating Putty already. There's no error message, just a "ding" then I click on Open. It mainly uses SSH to establish a secure connection, but it can also connect via Telnet or serial cables for direct device access. 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. Try using other serial communication software (such as SecureCRT, MobaXterm, etc. The identified applications, Tera Term and PuTTY, are both industry-standard tools for serial communication and terminal emulation, matching the requirements of the question. amoksg, 9trwuua, 0xzxea, 6mflos, 7knuq, hc3aaw, 5jluhfl, nl4, htv1hu, swejq,