I looked over the forums, but I can't seem to find a straight answer. I've used PcHelpWare between 2 computers in my house, and it works fine.
I'm trying to connect to a friends computer over the internet using uvnc.com as a repeater. the problem is he keeps getting the message "an existing connection was forcibly closed"
All I really want to know is if it an issue with his PC or Router, and if so, how it can be resolved.
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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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- Reddit community: https://www.reddit.com/r/ultravnc
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An existing connection was forcibly closed
Re: An existing connection was forcibly closed
Sounds like the repeater at uvnc.com is not working properly.. Try with your own repeater
Bevtech
Windows XP Home, Pro SP2, Windows 2003 SBS server SP2 (EN), Windows Media Center Editon 2005, Windows Vista Home Premium, Fedora Core 6, Windows 9X, PcHelpWare 1.0, UltraVNC 1.0.8.2
User not developer ;)
Windows XP Home, Pro SP2, Windows 2003 SBS server SP2 (EN), Windows Media Center Editon 2005, Windows Vista Home Premium, Fedora Core 6, Windows 9X, PcHelpWare 1.0, UltraVNC 1.0.8.2
User not developer ;)
Re: An existing connection was forcibly closed
I can almost sure this is an issue of the repeater at uvnc.com
I got the same error when using the repeater at uvnc.com and unable to determine what/where cause the problem -- until a user (Ron Van de lLisdonk) post a message that disclosed his own repeater. (Ref: [topic=9551][/topic])
Then I carried a test immediately. With the same ID & password I created two servers, one using repeater at uvnc.com, and the other one using Ron Van de Lisdonk's
When the server connect to uvnc.com run, the info windows showed these messages:
Start
Using Repeater
uvnc.com
ID:7321
Connect repeater success
Setting up encryption
Waitung for Viewer...
Read Failed
10054
Encryption failed, if using proxy, new repeater listening to 443 and ........
an existing connection was forcibly closed
an existing connection was forcibly closed
Init Network failed
When another server connected to Ron Van de Lisdonk's, the info windows showed these messages:
Start
Using Repeater
(Lisdonk's repeater)
ID:7321
Connect repeater success
Setting up encryption
Waitung for Viewer...
Then I start the viewer at anther PC. OK, they can connect using Lisdonk's repeater.
I don't think its the duplicate ID problem, becasue I had changed several and still getting same error. I found quite a lot of users had been reporting this problem, but looks like nobody at uvnc.com is willing to investigate this issue.
I got the same error when using the repeater at uvnc.com and unable to determine what/where cause the problem -- until a user (Ron Van de lLisdonk) post a message that disclosed his own repeater. (Ref: [topic=9551][/topic])
Then I carried a test immediately. With the same ID & password I created two servers, one using repeater at uvnc.com, and the other one using Ron Van de Lisdonk's
When the server connect to uvnc.com run, the info windows showed these messages:
Start
Using Repeater
uvnc.com
ID:7321
Connect repeater success
Setting up encryption
Waitung for Viewer...
Read Failed
10054
Encryption failed, if using proxy, new repeater listening to 443 and ........
an existing connection was forcibly closed
an existing connection was forcibly closed
Init Network failed
When another server connected to Ron Van de Lisdonk's, the info windows showed these messages:
Start
Using Repeater
(Lisdonk's repeater)
ID:7321
Connect repeater success
Setting up encryption
Waitung for Viewer...
Then I start the viewer at anther PC. OK, they can connect using Lisdonk's repeater.
I don't think its the duplicate ID problem, becasue I had changed several and still getting same error. I found quite a lot of users had been reporting this problem, but looks like nobody at uvnc.com is willing to investigate this issue.
-
ron van de lisdonk
- Posts: 7
- Joined: 2006-11-06 16:57
- Location: manchester UK
Re: An existing connection was forcibly closed
Hi,
The reason for disclosing the address for now and not blocking access to it is simply because i wantesd some other members to try it.
not that you have and it was OK i know that my issues lie in our internal nw.
the repeater is outside of our network and seeing that you had no issues, it must have been our firewall setup internally which blocks it.
As I have mentioned on the orriginal; posting I will leave this repeater open for another couple of days or so before starting to secure it.
I will post a message when it has been closed off.
ta
The reason for disclosing the address for now and not blocking access to it is simply because i wantesd some other members to try it.
not that you have and it was OK i know that my issues lie in our internal nw.
the repeater is outside of our network and seeing that you had no issues, it must have been our firewall setup internally which blocks it.
As I have mentioned on the orriginal; posting I will leave this repeater open for another couple of days or so before starting to secure it.
I will post a message when it has been closed off.
ta
Re: An existing connection was forcibly closed
Hi! Ron Van de Lisdonk,
You help me to clear my confusion.
Because I don't have the resource to set up my own repeater, so far I can't do a test separated from uvnc.com.
So now I know my hardware/software/router setting has no problem at all. Thanks.
Note to the admin. of uvnc.com:
I can connect to the repeater of uvnc.com in past (in January and before) with the same server, but after then I always get the "an existing connection was forcibly closed" error as I mentioned. I believe many user would like to see this to be fixed, as this is the key of NAT2NAT connection for those don't have their own repeater.
You help me to clear my confusion.
Because I don't have the resource to set up my own repeater, so far I can't do a test separated from uvnc.com.
So now I know my hardware/software/router setting has no problem at all. Thanks.
Note to the admin. of uvnc.com:
I can connect to the repeater of uvnc.com in past (in January and before) with the same server, but after then I always get the "an existing connection was forcibly closed" error as I mentioned. I believe many user would like to see this to be fixed, as this is the key of NAT2NAT connection for those don't have their own repeater.

