Third Party FizzySteamworks/Mirror : Connection was closed by peer, Timed out attempting to negotiate rendezvous

I am building an online multiplayer game using Unity. I use the "Mirror" Library. After some time developing with the "Telepathy" transporter in local (opening two instances on my computer) I decide to move on to Steam multiplayer, using SteamWorks.NET the "FizzySteamWorks" library as a transporter. On the 25th of October, it worked. After this success, I continued adding feature etc. while not testing as I always needed a live cobaye for Steam Multiplayer. I finally test it again, I get this error
"Connection was closed by peer, Timed out attempting to negotiate rendezvous"
on my client while trying to connect to the host. I try to fix it, doesn't work. I go back to my commit of the 25th, I get the same error. The error comes from file of the FizzySteamworks library, which I copy-pasted in the file system, so there's no way it updated without me knowing. I do not understand how the same code can go from working to not working in a week, maybe it comes from Steam ? Or from a file ignored by git ? Here is the content of my .git ignore :

Code (CSharp):

1. #
2. # Get latest from https://github.com/github/gitignore/blob/master/Unity.gitignore
3. #
4. /[Ll]ibrary/
5. /[Tt]emp/
6. /[Oo]bj/
7. /[Bb]uild/
8. /[Bb]uilds/
9. /[Ll]ogs/
10. /[Mm]emoryCaptures/
11.  
12. # Asset meta data should only be ignored when the corresponding asset is also ignored
13. !/[Aa]ssets/**/*.meta
14.  
15. # Uncomment this line if you wish to ignore the asset store tools plugin
16. # /[Aa]ssets/AssetStoreTools*
17.  
18. # Autogenerated Jetbrains Rider plugin
19. [Aa]ssets/Plugins/Editor/JetBrains*
20.  
21. # Visual Studio cache directory
22. .vs/
23.  
24. # Gradle cache directory
25. .gradle/
26.  
27. # Autogenerated VS/MD/Consulo solution and project files
28. ExportedObj/
29. .consulo/
30. *.csproj
31. *.unityproj
32. *.sln
33. *.suo
34. *.tmp
35. *.user
36. *.userprefs
37. *.pidb
38. *.booproj
39. *.svd
40. *.pdb
41. *.mdb
42. *.opendb
43. *.VC.db
44.  
45. # Unity3D generated meta files
46. *.pidb.meta
47. *.pdb.meta
48. *.mdb.meta
49.  
50. # Unity3D generated file on crash reports
51. sysinfo.txt
52.  
53. # Builds
54. *.apk
55. *.unitypackage
56.  
57. # Crashlytics generated file
58. crashlytics-build.properties

Here are screens from my client console when it tries to connect :


The most important returns are, I guess, the message which says

Code (CSharp):

1. Connection was closed by peer, Timed out attempting to negotiate rendezvous
2. UnityEngine.Debug:Log (object)
3. Mirror.FizzySteam.NextClient:OnConnectionStatusChanged (Steamworks.SteamNetConnectionStatusChangedCallback_t) (at Assets/Mirror/Runtime/Transport/FizzySteamworks/NextClient.cs:137)
4. Steamworks.Callback`1<Steamworks.SteamNetConnectionStatusChangedCallback_t>:OnRunCallback (intptr) (at Assets/Mirror/Runtime/Transport/FizzySteamworks/Dependencies/Runtime/CallbackDispatcher.cs:291)
5. Steamworks.CallbackDispatcher:RunFrame (bool) (at Assets/Mirror/Runtime/Transport/FizzySteamworks/Dependencies/Runtime/CallbackDispatcher.cs:191)
6. Steamworks.SteamAPI:RunCallbacks () (at Assets/Mirror/Runtime/Transport/FizzySteamworks/Dependencies/Runtime/Steam.cs:112)
7. SteamManager:Update () (at Assets/Mirror/Runtime/Transport/FizzySteamworks/Scripts/Steamworks.NET/SteamManager.cs:169)

followed by the error which says :

Code (CSharp):

1. The connection attempt was cancelled.
2. UnityEngine.Debug:LogError (object)
3. Mirror.FizzySteam.NextClient/<Connect>d__26:MoveNext () (at Assets/Mirror/Runtime/Transport/FizzySteamworks/NextClient.cs:80)
4. System.Threading.CancellationTokenSource:Cancel ()
5. Mirror.FizzySteam.NextClient:Disconnect () (at Assets/Mirror/Runtime/Transport/FizzySteamworks/NextClient.cs:148)
6. Mirror.FizzySteam.NextClient:OnConnectionStatusChanged (Steamworks.SteamNetConnectionStatusChangedCallback_t) (at Assets/Mirror/Runtime/Transport/FizzySteamworks/NextClient.cs:138)
7. Steamworks.Callback`1<Steamworks.SteamNetConnectionStatusChangedCallback_t>:OnRunCallback (intptr) (at Assets/Mirror/Runtime/Transport/FizzySteamworks/Dependencies/Runtime/CallbackDispatcher.cs:291)
8. Steamworks.CallbackDispatcher:RunFrame (bool) (at Assets/Mirror/Runtime/Transport/FizzySteamworks/Dependencies/Runtime/CallbackDispatcher.cs:191)
9. Steamworks.SteamAPI:RunCallbacks () (at Assets/Mirror/Runtime/Transport/FizzySteamworks/Dependencies/Runtime/Steam.cs:112)
10. SteamManager:Update () (at Assets/Mirror/Runtime/Transport/FizzySteamworks/Scripts/Steamworks.NET/SteamManager.cs:169)

Here is the return I get from my host console, it doesn't notify the failure anyhow.

 

Change your "FizzySteamworks" package to 4.4.1 should help!

 

4.4.1 Doesn't seem to solve the problem.........

 

Hello，Have you solved this problem? I had the same problem.

 

I got same error and even I hard-reset my branch, it was still bugged.
In my case, the problem was not with the Unity, but with my router.
After I reboot my rooter, the problem solved.