Hello,
I started to use vnc repeater in mode 2 to bypass NAT on both server and viewer side following this tutorial: https://www.uvnc.com/docs/uvnc-repeater.html
So far I used standard port 5900 for Viewer and 5500 for server and it is working fine. I have the following 2 questions :
1/ Is it possible to use the same port for both the viewer and server and then leave the status allocation of the devices as viewer or server at the repeater reception, potentially by updating source code of the repeater
2/ I saw a mode 3 available with SSL https://www.uvnc.com/pchelpware/sc/repeater.html with the following disclaimer
SSL is currently ONLY supported with a special viewer and SCIII
Is there any SSL repeater available for testing also ?
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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
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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
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Repeater ports
-
adam314315
- 8

- Posts: 8
- Joined: 2019-10-16 11:16
Re: Repeater ports
Any ideas to share about these 2 questions ?
Re: Repeater ports
It's not completely clear what your aim is.
I assume you use Mode II with reverse winvnc connection at the moment?
Same port not possible. Using TLS for server/viewer means using and enforcing secureVNCplugin.
Most firewalls filtering outgoing traffic won't block your reverse winvnc connection, if you configure at least port 443 on the repeater for incoming winvnc server connections.
For TLS on the Webserver part of repeater, we use "stunnel". Works like a charm.
I assume you use Mode II with reverse winvnc connection at the moment?
Same port not possible. Using TLS for server/viewer means using and enforcing secureVNCplugin.
Most firewalls filtering outgoing traffic won't block your reverse winvnc connection, if you configure at least port 443 on the repeater for incoming winvnc server connections.
For TLS on the Webserver part of repeater, we use "stunnel". Works like a charm.
