Start an elevated command prompt (run cmd.exe as administrator), and then run:
reg add "HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows NT\Terminal Services\Client" /v fClientDisableUDP /d 1 /t REG_DWORD
| Registry Hive | HKEY_LOCAL_MACHINE |
| Registry Path | SOFTWARE\Policies\Microsoft\Windows NT\Terminal Services\Client |
| Value Name | fClientDisableUDP |
| Value Type | REG_DWORD |
| Enabled Value | 1 |
| Disabled Value | 0 |
OR
gpedit.msc
Step 1. From the Windows 10 machine open Run application.
RDP Connection Freezes in Windows 10
Step 2. Type gpedit.msc and click OK to open Local Group Policy Editor.
RDP Connection Freezes in Windows 10
Step 3. Expand Computer Configuration > Administration Templates > Windows Components > Remote Desktop Services > Remote Desktop Connection Client. Double click the setting “Turn Off UDP On Client”. Choose Enabled option to enable this setting. Click Apply to apply the change.
Now you can open Remote Desktop connection application and start new session. This should fix the freezing issue.