How to enable COM ports on Windows 11 - Microsoft Q&A
Nov 15, 2025 · How do I enable COM ports on Windows 11. Only USB ports are shown on control panel.
Service overview and network port requirements for Windows
Jan 15, 2025 · This article discusses the required network ports, protocols, and services that are used by Microsoft client and server operating systems, server-based programs, and their …
Windows 11 doesn't show COM/LPT in Device Manager
Jan 16, 2025 · The ‘Ports (COM and LPT)’ section is usually shown in the Device Manager in Windows 11, but sometimes you may need to manually add or install the relevant drivers to …
Com Port Address Settings Windows 11 - Microsoft Q&A
May 27, 2022 · I do not have an advanced tab on the properties window to change com port address in Windows 11. How do I change COM port address or enable the advanced tab in …
No COM ports in Windows 11? - Microsoft Q&A
Jul 17, 2022 · Windows 11 New laptop, I have applications that require com ports 3 and 4 to connect to hardware via USB port. There doesn't seem to be any COM ports and no way to …
last windows 11 update appears to have disabled the display ports …
Nov 20, 2025 · This is an issue since 3 of the 4 ports on my card are display ports. Doesn't matter which monitor is plugged into the display port is does not work. I have done a clean install on …
In Windows 11 only one Ports (COM & LPT) shows
Jan 23, 2025 · Hi Welcome to Microsoft community.Based on your description and the search results, the disappearance of COM ports in Windows 11 Device Manager is a known issue, …
Unable to find USB Serial Port (Ports COM & LPT) in Device …
Jul 15, 2023 · Check for system updates: Make sure your Windows 11 system is up to date, there may be some updates that fix device management issues. Check BIOS Settings: In rare …
Windows 11 reports virtual COM ports are in use when they aren't.
Feb 29, 2024 · I have a serial peripheral that works great on my Windows 10 desktop, using a USB-Serial cable. When I try to use the peripheral on a Windows 11 laptop (I tried two of them …
TCP/IP port exhaustion troubleshooting - Windows Client
Jan 15, 2025 · Applies to: Windows 10 TCP and UDP protocols work based on port numbers used for establishing connection. Any application or a service that needs to establish a TCP/UDP …