When the viewer specifies using a dsmplugin, if connecting to a server not using encryption, the viewer should pop up a warning window of "Accept insecure connection". However, this feature is broken on 1.0.9.5 and 1.0.9.6, the connection is established without this warning. Even worse, when checking the viewer's Connection Info, it reported the configured dsmplugin was being used.
Both normal and reverse connection have this problem.
Have verified with 1.0.8.2 viewer, no such bug.
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
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2025-12-03: Could you please complete our poll/survey? Renaming UltraVNC files and service to be more clear: https://forum.uvnc.com/viewtopic.php?t=38128
There was a problem to vote, it is solved now! Thanks in advance!
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
Join us on social networks and share our announcements:
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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
2025-12-05: Celebrating the 23th anniversary of the UltraVNC (26th anniversary since the laying of the foundation stone): https://forum.uvnc.com/viewtopic.php?t=38130
2025-12-03: Could you please complete our poll/survey? Renaming UltraVNC files and service to be more clear: https://forum.uvnc.com/viewtopic.php?t=38128
There was a problem to vote, it is solved now! Thanks in advance!
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
Join us on social networks and share our announcements:
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VNCviewer Bug -- No Warning when connecting to a Non-encrypt
Re: VNCviewer Bug -- No Warning when connecting to a Non-enc
bug confirmed
uvnc 1.0.9.6 release vncviewer date 4.4.2011 and winvnc 1.4.2011
vnc viewer status HOSTNAME
Status: Connected (SecureVNCPlugin-v2.3.0.0)
In progress (no encryption)
viewer use encryption plugin but not server
options.vnc
UseDSMPlugin=1
DSMPlugin=SecureVNCPlugin.dsm
AutoAcceptIncoming=0
AutoAcceptNoDSM=0
RequireEncryption=0
uvnc 1.0.9.6 release vncviewer date 4.4.2011 and winvnc 1.4.2011
vnc viewer status HOSTNAME
Status: Connected (SecureVNCPlugin-v2.3.0.0)
In progress (no encryption)
viewer use encryption plugin but not server
options.vnc
UseDSMPlugin=1
DSMPlugin=SecureVNCPlugin.dsm
AutoAcceptIncoming=0
AutoAcceptNoDSM=0
RequireEncryption=0
UltraVNC 1.0.9.6.1 (built 20110518)
Windows OS: XP Home + Vista Business + 7 Home
Only experienced user, [u]not[/u] developer
Windows OS: XP Home + Vista Business + 7 Home
Only experienced user, [u]not[/u] developer
Re: VNCviewer Bug -- No Warning when connecting to a Non-enc
vncviewer 10961 (15 April)
winvnc 10961 (16 April)
short test
winvnc NO plugin
vncviewer with securevncplugin.dsm
vncviewer
ok direct connection, message and prompt pwd + conexion OK
ok via repeater ID message and connection OK
not tested from comand line, tested only from vncviewer GUI
(no encryption)
winvnc 10961 (16 April)
short test
winvnc NO plugin
vncviewer with securevncplugin.dsm
vncviewer
ok direct connection, message and prompt pwd + conexion OK
ok via repeater ID message and connection OK
not tested from comand line, tested only from vncviewer GUI
(no encryption)
Last edited by redge on 2011-04-18 18:51, edited 1 time in total.
UltraVNC 1.0.9.6.1 (built 20110518)
Windows OS: XP Home + Vista Business + 7 Home
Only experienced user, [u]not[/u] developer
Windows OS: XP Home + Vista Business + 7 Home
Only experienced user, [u]not[/u] developer
Re: VNCviewer Bug -- No Warning when connecting to a Non-enc
Still a minor defect.
The viewer's Connection Info still showing a plugin is used, in fact not.

The viewer's Connection Info still showing a plugin is used, in fact not.

- Rudi De Vos
- Admin & Developer

- Posts: 6978
- Joined: 2004-04-23 10:21
- Contact:
Re: VNCviewer Bug -- No Warning when connecting to a Non-enc
Technical, plugin is used even without encryption.
Message
Status: Connected (SecureVNCPlugin-v2.3.0.0)
In progress (no encryption)
Older plugins get unloaded,
SecureVNCPlugin-v2.3.0.0 stay loaded, even when not used.
This change in behaviour caused the initial error.
Message
Status: Connected (SecureVNCPlugin-v2.3.0.0)
In progress (no encryption)
Older plugins get unloaded,
SecureVNCPlugin-v2.3.0.0 stay loaded, even when not used.
This change in behaviour caused the initial error.
UltraVNC links (join us on social networks):
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- GitHub sourcecode: https://github.com/ultravnc/UltraVNC
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- Website: https://uvnc.com/
- Forum: https://forum.uvnc.com/
- GitHub sourcecode: https://github.com/ultravnc/UltraVNC
- Mastodon: https://mastodon.social/@ultravnc
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- Reddit community: https://www.reddit.com/r/ultravnc
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