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Screen Sharing or VNC Connection Refused

Connecting to a Mac

Authentication Error

This error means that the username and/or password you used to establish the Screen Sharing connection to a Mac are incorrect. Make sure that you use your Mac username and password, not your Screens ID in the Authentication section.

You can refer to this article in order to find out what your Mac user is.

Also, ensure that your Mac user is allowed to connect via the Screen Sharing/Remote Management (and Remote Login, if applies) services. Look for "Allow access for:" in the article for more details.

 

Once you have the correct Mac username, update your saved screen settings and re-type your password (if it was saved already) in order to make sure that it is correct:

Screens for iOS:

update-mac-user-credentials.jpeg

Screens for macOS:

mac-user-mac.png

Also, ensure that your Mac user (or all users) is/are allowed to connect via the Remote Management service by consulting this article (look for Allow access for:)

allow-access-for.png

You will find more details in this article: Configuring macOS for Remote Access

Remote Desktop/ARD preventing connections

If Remote Desktop is currently running on the Mac you're trying to connect to, it will deny any attempts to connect via Screen Sharing (Remote Management). 

Here's an excerpt from a log file on Console.app:

09:45:25.586295 -0700 screensharingd Do not allow access since Remote Desktop is open

Close Remote Desktop and try to connect again.

Another more permanent solution is to configure Remote Desktop to allow incoming connections in the app preferences:

ard-allow-connections.png

It is also a known issue that ARD may cause connection issues in some circumstances. The solution for this is to re-install ARD, as mentioned in this thread:

https://discussions.apple.com/thread/8354421

The latest of Remote Desktop is available here.

Connecting to another computer type

On Linux, Raspberry Pi or Windows, this means that the VNC password is incorrect.

Refer to the initial computer configuration articles for more information:

Configuring Windows for Remote Access

Configuring Linux for Remote Access

Configuring a Raspberry Pi for Remote Access

 

 

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