エラーコード 0x516: 実証済みの解決策によるリモートデスクトップの修復方法

Error code 0x516 means Windows Remote Desktop thinks someone else is already connected to your computer, even when they’re not. This happens due to stuck sessions, missing passwords, session limits, or network configuration issues.

The fix depends on your specific situation. Most users solve it by adding a password to their Windows account, toggling Remote Desktop off and back on to clear stuck sessions, adjusting session limits in Group Policy, or fixing their router’s port forwarding settings. These solutions work across Windows 10, 11, and Server versions.

I’ve been tracking this issue across tech forums for weeks now, and it’s one of those errors that makes people want to throw their keyboards across the room. The error message doesn’t actually tell you what’s wrong, which is particularly unhelpful when you’re staring at it for the third time in five minutes.

If you’d rather skip the phantom-session guesswork entirely, HelpWire is worth knowing about upfront: it’s a free remote access tool that doesn’t use Windows’ own session-limit tracking, so there’s no stuck “ghost” session for it to trip over in the first place, and no single-session-at-a-time restriction to hit either. A session starts from a link instead of a session ID, so there’s nothing for Windows to mistake for a leftover connection. It runs on Windows, macOS, and Linux, which matters here since 0x516 is partly a Windows Home/Pro session-limit quirk to begin with. More on it near the end.

Let me walk you through the fixes that actually work.