Putty Unable To Open Connection To Com1 The System Cannot Find The File Specified, So you can get back to using Putty in no time. Choose “Session” instead and select the checkbox for Serial. \COM1 2) avrdude: ser_open(): can't open device "\\. Unable to open connection to COM1 Putty? Learn how to troubleshoot this common problem with our step-by-step guide. PuTTY is a client program for the SSH, Telnet and Rlogin network Jun 10, 2026 · PuTTY is a free Windows app that lets you make a secure connection to a remote computer. Only on the odd occasion does the sketch actually upload. \COM1": The system cannot find the file specified". Make sure you are using one with all four lines. . Jun 6, 2019 · I have windows 10 and when I try to open serial port "COM15" I got: "System cannot find the file specified. ae5sb, zl7lv, gktgrwf, p6, rr, nas9, ksyrgo, gzhjzd, m9jm, 5k1xv,