After more 2 000 000 (two million) views on forum for 1.5.0.x development versions... and 1.6.1.0, 1.6.3.0-dev versions
A new stable version, UltraVNC 1.6.4.0 and UltraVNC SC 1.6.4.0 have been released: https://forum.uvnc.com/viewtopic.php?t=38095
Feedback is always welcome

2026-04-01: After 1.7.x, 1.8.x release builds need tests and feedback: https://forum.uvnc.com/viewtopic.php?t=38158

2026-03-11: CVE-2026-3787 and CVE-2026-4962 - Clarification: https://forum.uvnc.com/viewtopic.php?t=38155

2025-12-02: We need help: English Wikipedia UltraVNC page has been requested to deletion: https://forum.uvnc.com/viewtopic.php?t=38127
Any help is welcome to improve the UltraVNC page and/or to comment on the Wikipedia Talk page

2025-05-06: Forum password change request: https://forum.uvnc.com/viewtopic.php?t=38078

2023-09-21: Important: Please update to latest version before to create a reply, a topic or an issue: https://forum.uvnc.com/viewtopic.php?t=37864

Development: UltraVNC development is always here... Any help is welcome
Feedback is welcome

Help is very needed for:
Windows ARM/ARM64 support: https://forum.uvnc.com/viewtopic.php?t=38163 / https://github.com/ultravnc/UltraVNC/issues/346
macOS support: https://forum.uvnc.com/viewtopic.php?t=38164 / https://github.com/ultravnc/UltraVNC/issues/347
Linux support: https://forum.uvnc.com/viewtopic.php?t=38165 / https://github.com/ultravnc/UltraVNC/issues/348
*BSD support: https://forum.uvnc.com/viewtopic.php?t=38166 / https://github.com/ultravnc/UltraVNC/issues/349
*Solaris support: https://forum.uvnc.com/viewtopic.php?t=38167 / https://github.com/ultravnc/UltraVNC/issues/350

Authentication rejected

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ASF
Posts: 1
Joined: 2022-05-08 22:03

Authentication rejected

Post by ASF »

I have installed UltraVNC on two PC's that I am currently logged into via RDP. I have set a 6-character password, but whenever I attempt to connect from either of the PC's to the other using that password, I get "authentication rejected". I installed using all default settings and am at a loss as to what I could be doing wrong. Can anyone assist?
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Rudi De Vos
Admin & Developer
Admin & Developer
Posts: 7021
Joined: 2004-04-23 10:21
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Re: Authentication rejected

Post by Rudi De Vos »

The password is in the ultravnc.ini, if for some reason the user don't have permission to save at this location it fail.

At your home pc, copy winvnc.exe to a temp folder, run winvnc from there and set a password.
Now you have a ultravnc.ini in the temp folder.
This is portable, you can copy it to the eral folder of winvnc.exe (C:\Program Files\uvnc bvba\UltraVNC)
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- Forum: https://forum.uvnc.com/
- GitHub sourcecode: https://github.com/ultravnc/UltraVNC
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- Bluesky/AT Protocol: https://bsky.app/profile/ultravnc.bsky.social
- Facebook: https://www.facebook.com/ultravnc1
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- OpenHub: https://openhub.net/p/ultravnc
- uvnc2me: https://uvnc2me.com/
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