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A rejected password in Mac Screen Sharing does not prove that you typed the wrong characters. macOS can ask for credentials for an authorized Mac user, while a VNC viewer uses a separate VNC password configured for that service. The first fix is therefore to identify the connection method, then match its credential to the host Mac’s access settings.
Use the sequence below: identify the client, verify who is allowed to connect, enter the right username format, check the method-specific password, inspect the saved server entry, and only then investigate network reachability.
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Why a correct password can be rejected
“Screen sharing” describes more than one connection path. Apple’s built-in Screen Sharing app and Mac-to-Mac screen sharing authorize an account that the host Mac permits. A VNC viewer, by contrast, can be enabled with a password specifically for VNC access. Apple states that this VNC password is determined by the VNC configuration and does not necessarily match another password on the system (Apple’s VNC access guidance).
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That distinction creates several apparently identical failures: a VNC password entered into a Mac-user prompt, a valid Mac account used when the host only permits other users, a username saved for a different Mac, or a connection aimed at the wrong server. A password cannot override an access list on the host.
First identify which connection you are making
Before changing any password, look at the application and the dialog in front of you. Record whether you are using:
- Another Mac’s Screen Sharing app or Finder connection: this normally asks for an account that the host Mac has authorized.
- A third-party VNC viewer: this may request the VNC password configured under the host’s VNC settings, not the password used to unlock the Mac.
- Apple Remote Desktop: this is a separate administration product with broader management functions. Apple documents that it can install and configure apps, but its connection workflow and account policy should be checked in the product’s own documentation (Apple’s Screen Sharing guide).
Do not infer the credential type from the word “password” alone. Note the client name, the exact server address shown, and whether the prompt mentions a user name or VNC.
Check the host Mac’s Screen Sharing permissions
Perform this check on the Mac you are trying to control. Open System Settings > General > Sharing > Screen Sharing. Apple’s host-side instructions explain that Screen Sharing must be enabled and that access can be granted to all users or restricted to selected users (Turn Mac screen sharing on or off).
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- Turn on Screen Sharing if it is off.
- Look at the access control. If it is set to selected users, open the user list.
- Add the intended account if it is missing, or remove an obsolete account that you no longer want to authorize.
- Save the change, then disconnect and start a new connection attempt.
A valid credential for an account outside that list will still be denied. This is an authorization failure, not evidence that the password itself is invalid.
Use the username format macOS accepts
When a Screen Sharing prompt asks for a user name, try both the person’s full name and the account name. Apple explicitly documents that either can be entered when connecting for screen sharing (If you forgot your user or account name on Mac).
Finding the account name on the host
On the host Mac, open System Settings > Users & Groups and select the intended user. Use the account details shown there rather than an email address that happens to be associated with the person. If the full name contains spaces, try the account name when a client rejects the full-name version.
Correcting a saved username
Some clients remember the previous user name. Delete the stored value or edit it before reconnecting. A cached username for a different account can make a correct password appear to fail repeatedly.
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Built-in Mac Screen Sharing
For the Mac’s own Screen Sharing workflow, enter the password belonging to the authorized account on the host Mac. Confirm that the account is the one listed in Screen Sharing access. Do not substitute an Apple Account password merely because it is associated with the same person.
VNC viewer access
For a VNC viewer, enter the VNC password configured for VNC access on the host. It may be intentionally different from every local login password. Apple’s wording is unambiguous: “The VNC password doesn’t necessarily correspond to any other password on the system, and is determined by the VNC configuration” (Virtual Network Computing access and control with Remote Desktop).
If nobody knows that VNC password, an administrator must inspect the host’s VNC configuration and set a new one according to the viewer and macOS version in use. Changing the Mac user’s login password will not automatically change a separately configured VNC password.
Do not confuse either password with an Apple Account password
A Mac login password and an Apple Account password serve different purposes. Apple’s recovery guidance discusses those credentials separately for local Mac login recovery; it does not establish an Apple Account password as a universal credential for remote Screen Sharing (If you forgot your Mac login password). Use the credential requested by the connection method instead.
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Screen Sharing clients store connection details that can be wrong even when the password is right. Open the connection’s information or edit screen and verify:
- Server address: it must identify the intended Mac, not an old computer, a stale local hostname, or a copied address with a typo.
- Username: replace a remembered account with the authorized full name or account name.
- Port: Apple documents TCP port 5900 as the default for Mac screen-sharing connections (Change screen sharing connection settings on Mac).
After correcting a field, save the entry or create a fresh connection rather than repeatedly retrying the old one. This isolates a credential problem from a destination problem.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.A practical troubleshooting sequence
Follow these steps in order so that each result narrows the cause:
- Identify the client. Write down whether it is built-in Screen Sharing, a VNC viewer, or Apple Remote Desktop. Treat each password prompt as method-specific.
- Confirm the host. Compare the displayed server name or address with the Mac you intend to control. If you have several Macs, disconnect from the old saved entry first.
- Verify host authorization. On the host, use System Settings > General > Sharing > Screen Sharing and confirm that the service is on and the intended account is allowed.
- Correct the username. Try the full name and account name accepted by macOS. Remove any stale saved username.
- Enter the method’s password. Use the authorized Mac account password for built-in Screen Sharing, or the configured VNC password for a VNC viewer.
- Check the saved server settings. Verify address, username, and the default TCP port 5900 unless an administrator deliberately configured another port.
- Retry once from a new connection. A fresh session prevents an old cached credential from obscuring the result.
- Escalate to network checks only if indicated. Investigate reachability or filtering when the host cannot be found, the connection times out, or the service is unreachable—not merely because a password dialog rejected an entry.
Read the symptom instead of guessing
| What you see | Most useful next check | Why it matters |
|---|---|---|
| Password rejected immediately | Confirm whether the client is Screen Sharing or VNC, then use that method’s credential. | The two methods can expect different passwords. |
| Login repeats after you enter a known password | Check the host’s selected-user list and try the account name instead of the full name. | Authorization and username parsing occur before a session opens. |
| The connection reaches a prompt for the wrong Mac | Inspect the saved server address and create a new entry. | A correct password for one Mac will fail on another. |
| The host cannot be found or the attempt times out | Verify the address, host availability, and network path; then check port 5900 if the deployment uses the default. | This points to reachability rather than password validation. |
| VNC connects but behaves unexpectedly | Review the VNC configuration and client security capabilities. | VNC settings and encryption behavior differ by implementation. |
VNC access has a security trade-off
Enabling VNC can make remote support practical, but Apple warns that third-party VNC viewers may not encrypt keystrokes (Apple’s VNC security guidance). Treat the configured VNC password as a dedicated remote-access secret:
- Give it only to people who need access.
- Do not reuse an important local or account password.
- Disable VNC access when it is no longer required.
- Prefer a viewer and network design that protect credentials and keystrokes in transit.
- Keep the host’s allowed-user list as narrow as the job permits.
A password that works is not automatically a secure deployment. The authentication method, who is authorized, and how traffic is protected are separate decisions.
When to involve an administrator
Ask the person responsible for the host or network to intervene when you cannot edit Screen Sharing settings, do not know the VNC password, or need a non-default port. They can confirm which service is enabled, reset a dedicated VNC credential, verify the selected-user list, and check whether a firewall or network policy blocks the host. Avoid changing router or firewall rules as a first response to an ordinary rejected-password message; the documented default port alone does not prove that filtering is the cause.
What not to do
- Do not keep trying the Apple Account password against every prompt.
- Do not assume a Mac login password is the VNC password.
- Do not remove all access restrictions just to make one connection work.
- Do not change network equipment before confirming the client, host, username, and saved address.
- Do not share a VNC password broadly when a selected-user Screen Sharing setup would provide narrower access.
The shortest reliable fix
Identify the client first. On the host, enable Screen Sharing and authorize the intended user. Enter that user’s full name or account name, then use the password required by the method: the authorized Mac account for built-in Screen Sharing or the separately configured VNC password for a VNC viewer. Finally, correct the saved server address and username, with TCP port 5900 as Apple’s documented default. If the host still cannot be reached, you now have evidence to investigate the network rather than guessing at passwords.
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