Troubleshooting False Error Message: Password Not Enabled/Valid in UltraVNC 1.4.3.6

Troubleshooting False Error Message: "Password Not Enabled/Valid" in UltraVNC 1.4.3.6

In this article, we will dive into the common issue of the false error message "Password Not Enabled/Valid" when connecting to two remote workstations using Windows 11 with UltraVNC service version 1.4.3.6. We will discuss the potential causes of this error message and provide detailed solutions for resolving it. This article aims to help system administrators, support professionals, and general users who encounter this error and seek a solution.

Understanding the UltraVNC Service

UltraVNC is a powerful, easy-to-use, and open-source remote desktop software that allows users to view and control a computer remotely. It utilizes VNC (Virtual Network Computing) server and viewer technology, making it a convenient solution for remote support and administration.

Identifying the False Error Message

When attempting to connect to a remote workstation, you might encounter the following error message:

"Password Not Enabled/Valid on the viewer side"

However, the password is correctly set on both the server and viewer sides, making this a "false" error message. This issue typically arises when using UltraVNC version 1.4.3.6.

Cause and Solution

This error message is due to a compatibility issue between the UltraVNC server and viewer. The server incorrectly interprets that the password is not properly configured on the viewer side, even when it is. The solution involves updating the UltraVNC server and/or viewer to the latest version or applying a specific fix for this version.

Updating UltraVNC

The most straightforward way to resolve this issue is by updating both the UltraVNC server and viewer to the latest version. Simply visit the official UltraVNC download page to acquire the latest version, which includes bug fixes and improved compatibility.

However, if updating is not an option due to specific requirements or constraints, you can apply a fix to the existing UltraVNC 1.4.3.6 service.

Applying the UltraVNC 1.4.3.6 Fix

You can resolve this issue without updating UltraVNC by applying the following fix directly to the UltraVNC 1.4.3.6 service:

1. Navigate to the UltraVNC winvnc.exe file location.

2. Edit the winvnc.exe file using a hex editor, such as HxD.

3. Search for the 58 8B 5C 24 04 byte sequence and replace it with 33 C0 8B 5C 24 04.

4. Save the changed winvnc.exe file and restart the UltraVNC service on the remote workstation.

Additional Considerations

After applying the fix or updating to the latest version of UltraVNC, ensure that the password is correctly configured on both the server and viewer sides:

1. In the UltraVNC server settings, navigate to Options > Security.

2. Check the Require MS Logon and VNC Password boxes.

3. Enter and confirm the password.

Perform the same steps on the UltraVNC viewer side to ensure that the password settings match.

• Issue: False error message "Password Not Enabled/Valid" in UltraVNC 1.4.3