內網開發最常用的莫過於Windows的遠程連接服務了。但是有時候這個遠程連接是灰色的，無法勾選。折騰了各種辦法。最后在這里找到了答案。https://answers.microsoft.com/en-us/windows/forum/all/allow-remote-assistance-connections-to-this/d00637ad-806e-4ba6-bcde-8de655c5462c
If your running Windows 7 Home Premium you can configure this in the registry because you can not use the group policy editor. Go to Start and type cmd in the search window. Right click on cmd.exe and select Run as administrator. At the command prompt type regedit. Navigate to the HKLM\SOFTWARE\Policies\Microsoft\WindowsNT\Terminal Services path and make sure there is not a DWORD named fAllowToGetHelp. If there is delete it.
翻譯成中文就是除了常見的禁用遠程連接的方法之外。通過配置fAllowToGetHelp一樣可以禁用遠程連接。如果在注冊表的這個目錄中HKLM\SOFTWARE\Policies\Microsoft\WindowsNT\Terminal Services看到有fAllowToGetHelp。把它刪掉就可以勾選遠程連接了。HKLM是HKEY_LOCAL_MACHINE的縮寫。
關於fAllowToGetHelp，可以點擊這個連接了解詳情：https://docs.microsoft.com/en-us/previous-versions/windows/it-pro/windows-vista/cc721976(v=ws.10)
遠程連接可以勾選之后，發現下面的允許遠程連接到此計算機依舊無法勾選。查看可以正常過使用的電腦對比，發現正常情況下HKLM\SOFTWARE\Policies\Microsoft\WindowsNT\Terminal Services這個路徑下面應該只有一個默認項。而有問題的這台機器則多處好幾項。將多出選項刪除之后遠程連接恢復正常。
正常電腦如圖。如果存在其他項，建議刪除。