Problem with security on UltraVNC SC

Fantom · Post by **Fantom** » 2023-10-09 12:39

How can I add plugin for UltraVNC SC Viewer 1.4.3.5?

I start it from cmd:

vncviewer -listen -dsmplugin msrc4plugin_for_sc.dsm

and when client try connect to me (using -secureplugin -connect), i get error:
The Plugin cannot be loaded. Please check its integrity.

Fantom

Post by **RudiDeVos** » 2023-10-09 15:52

UltraVNC SC uses the latest plugin, it's buildin.

If you use the 64-bit version of the UltraVNC Viewer:

Code: Select all

vncviewer -listen -dsmplugin SecureVNCPlugin.dsm or SecureVNCPlugin64.dsm

Fantom · Post by **Fantom** » 2023-10-10 09:45

vncviewer -listen -dsmplugin SecureVNCPlugin.dsm

Now i have error: Server closed connection. Your connection has been rejected.

Do I need to configure it somehow?

Post by **RudiDeVos** » 2023-10-10 18:49

Please see: SC subsection:
- https://uvnc.com/downloads/ultravnc/158 ... 4-3-5.html

Fantom · Post by **Fantom** » 2023-10-11 18:25

But I try use this new one (experimental) from:
- https://forum.uvnc.com/viewtopic.php?t=37866

Post by **RudiDeVos** » 2023-10-11 19:55

Code is the same, the UltraVNC SC Online Creator uses the same EXE as you can download using the ZIP.

UltraVNC SC requires a key for authentication
One part need to be distributed with the UltraVNC Server, the contra key is used by the UltraVNC Viewer
The keys are a pair

It's explained in SC subsection:
- https://uvnc.com/downloads/ultravnc/158 ... 4-3-5.html

Post by **RudiDeVos** » 2023-10-16 19:13

Seems latest plugin doesn't like the be embedded.
For now added back the previous plugin.
UltraVNC SC Online Creator also updated.

New version:
- https://uvnc.eu/download/1430/UltraVNC_SC_1436.zip

Fantom · Post by **Fantom** » 2023-12-01 12:42

Ok.

I generated keys, and download UltraVNC SC.
In catalog I have:
- vncviewer.exe
- MSRC4Plugin_for_sc.dsm
- SC_Viewer_ClientAuth.pkey

I run UltraVNC from batch file:

Code: Select all

vncviewer -listen -dsmplugin MSRC4Plugin_for_sc.dsm

I run downloaded helpdesk.exe

I try connect to computer and I see error: "The plugin cannot be loaded. Please check its name integrity"

PS: I also run manualy UltraVNC Server, checked "Encryption use", select "MSRC4Plugin_for_sc", click "config" and I see this same error.

Post by **RudiDeVos** » 2023-12-02 16:58

MSRC4Plugin_for_sc.dsm is the old plugin used by the old UltraVNC SC versions.

All new versions use the SecureVNCPlugin.dsm, the UltraVNC Viewer also need to use SecureVNCPlugin.dsm (x86) or SecureVNCPlugin64.dsm (x64)

Fantom · Post by **Fantom** » 2023-12-04 07:18

Ok - now its works.

I misunderstood what x means "latest" and "previous" plugin

UltraVNC