It may have happened to you as well: you saw a Failed to connect to a Windows service error popping up on the bottom-right corner. You know that the black exclamation mark with the yellow background is usually not about something good.
But don’t fret over too much about this problem, there are some effective options that are going to help you with this error.
NOTE: Group Policy Client service is used only as an example. If the service on your PC is having a different name, then you should choose accordingly, such as System Event Notification Service or other services.
Warning: Before you proceed with the methods below, please make a system restore point first, just in case of any unwanted error.
Step 1: Use netsh winsock reset command
1) On your keyboard, press Windows key and X at the same time, then choose Command Prompt (Admin).
When prompted for administrator permission, hit Yes to continue.
2) In the command prompt window, type in the following command and hit Enter after each one.
3) Restart your computer now.
The problem should be gone now.
Step 2: Disable Fast Startup
1) Press the Start button, then choose Control Panel. In the view of Small icons, select Power Options.
2) On the left side of the pane, select Choose what the power button does.
3) Then click Change settings that are currently unavailable. You might need to type in your username and password to get the administrator permission.
4) Scroll down a little bit and unckeck the option Turn on fast startup (recommended). Then press Save changes and exit.
Step 3: Use Registry Editor
1) On your keyboard, press Windows key and R at the same time, then type in regedit and hit Enter.
When asked for administrator permission, hit Yes to continue.
2) Navigate to:
3) On the right side of the pane, double click netsvcs option, then check to see if gpsvcl is listed in the new opened window. (Click here if you cannot see netsvcs option.)
If gpsvcl option is missing, scroll down to the bottom and type gpsvcl in and hit OK to add it back.
a) Right click on SvcHost and choose New > Key.
b) Then change the newly created key to netsvcs.
c) On the right side of the pane, right click the empty space and choose New > DWORD (32-bit) Value.
d) Change the name of the newly created key to CoInitializeSecurityParam.
e) Double click the newly-created CoInitializeSecurityParam and change its value to 1. Click OK to save the change.
f) Now right click the empty space of the right panel of netsvcs key and choose New > DWORD (32-bit) Value.
g) Change the name of the value to CoInitializeSecurityAllowLowBox.
h) Double click CoInitializeSecurityAllowLowBox and change its value to 1. Hit OK to save the change.
i) Create a new 32-bit DWORD and name it AuthenticationCapabilities. Set its value to 3020 and click OK to save it.
j) Close the Registry Editor and restart your computer.
Step 4: Disable Windows Font Cache Service
According to some, Windows Font Cache Service can cause conflicts with other services. Hence, you can try to disable this service and see if it helps.
1) On your keyboard, press Windows key and R at the same time, then type in services.msc and hit Enter.
2) When Service window opens, press W key on your keyboard to fast locate Windows Font Cache Service. Right click it and choose Stop.
3) Now press Windows key and R at the same time and type %localappdata% in and hit Enter.
4) If you can see FontCache data files, just delete them.
5) Go back to Service window, right click Windows Font Cache Service, this time, choose Start.
Step 5: Disable User Account Control (UAC)
NOTE: Turning off user account control is a bit risky for novice users. If you are not sure what you are to do, please skip this part.
Some users mentioned that the Failed to connect to a Windows service error could be due to over sensitive UAC, which is a built-in feature that will ask for your permission when you are to do any changes to your PC. We can disable it for the time being and see if this problem is gone.
1) On your keyboard, press Windows key and S at the same time, then type in user accounts and choose User Accounts.
2) On the right side of the pane, choose Change User Account Control settings.
3) Toggle the slider to Never notify position. Then click OK to save the change.
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