I'm on a corporate network with many subnets. We do NOT plan on using this to connect outside of our network but all subnets should be able to connect. We stuck with 5901 and 443. Windows FW is off.
I put the repeater on, say, 192.168.1.100 which is a Windows Server 2003 machine. I run the viewer and it comes up and says:
WAN: Repeater server.domain.int (what I used for the WAN) connection established!
LAN: Repeater 192.168.1.100 connection established!
When I run the InstantSupport.exe, nothing is logged to the repeater. I'm not sure what I'm doing wrong.
Below is what I see when I run the viewer:
Viewer added to list 776475
ID added 776475
recv -1
ECONNRESET detected
Viewer removed from list 776475
accept() connection
Writing protocol version erro
accept() connection
Any ideas?
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
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There was a problem to vote, it is solved now! Thanks in advance!
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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:
- Website: https://uvnc.com/
- GitHub: https://github.com/ultravnc
- Mastodon: https://mastodon.social/@ultravnc
- Bluesky/AT Protocol: https://bsky.app/profile/ultravnc.bsky.social
- Facebook: https://www.facebook.com/ultravnc1
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Repeater sees ChunkViewer connections but "protocol erro"
Repeater sees ChunkViewer connections but "protocol erro"
You obviously lack the creative genius to integrate Legos and Duplos.
Re: Repeater sees ChunkViewer connections but "protocol erro
I just disabled the "enable prox(443)" setting and changed the Listen Port Server to 443 and now it seems to work??
You obviously lack the creative genius to integrate Legos and Duplos.
Re: Repeater sees ChunkViewer connections but "protocol erro
Good catch, I was puzzled for a bit why it wouldn't work.
The settings.txt for the included Windows Repeater doesn't have this option checked by default.
Windows Repeater settings should be this:

The settings.txt for the included Windows Repeater doesn't have this option checked by default.
Windows Repeater settings should be this:

ChunkVNC - Free PC Remote control with the Open Source UltraVNC wrapper InstantSupport!
Re: Repeater sees ChunkViewer connections but "protocol erro
Thanks for all your work, supercoe!
You obviously lack the creative genius to integrate Legos and Duplos.

