SOLVED: VPN "Kill Switch" breaks Jellyfin Server

[hammtronic]

*Update: Previously I reported this issue as Jellyfin failing to start. I found it was related to the VPN kill switch so I've updated the Subject but I'll leave the first post alone to leave the thread intact and in case it helps anyone with the same issue*

Jellyfin has been running fine for a month or so. After a computer restart, it has been failing to start again. When I try to run it from the System Tray launcher a popup message appears telling me "Could not start Jellyfin server process after the specified wait period." with directions for finding log files beneath (logs pasted below). The system tray icon remains available, but the option to Start goes back to being enabled and the option to Stop returns to disabled. So otherwise it seems like nothing is happening.

I've checked that Jellyfin is to the latest stable version and reset my computer a few times since then.

The logs make reference to Hosting failing to start, and problems with sockets. I haven't changed any networking on my host computer or in the hardware of my network.
I do run a VPN if that could somehow be relevant...

Jellyfin Version: 10.10.7
Installation Method: Windows Installer
Client: Chrome and Android app when it works, but I can't get that far because of this error at the server

---

Logs:

[2025-04-25 12:59:53.022 -04:00] [INF] [1] Main: Jellyfin version: "10.10.7"
[2025-04-25 12:59:53.038 -04:00] [INF] [1] Main: Environment Variables: ["[JELLYFIN_LOG_DIR, C:\ProgramData\Jellyfin\ServerData\log]"]
[2025-04-25 12:59:53.044 -04:00] [INF] [1] Main: Arguments: ["C:\Program Files\Jellyfin\jellyfin.dll", "--datadir", "C:\ProgramData\Jellyfin\ServerData"]
[2025-04-25 12:59:53.049 -04:00] [INF] [1] Main: Operating system: "Microsoft Windows 10.0.19045"
[2025-04-25 12:59:53.052 -04:00] [INF] [1] Main: Architecture: X64
[2025-04-25 12:59:53.055 -04:00] [INF] [1] Main: 64-Bit Process: True
[2025-04-25 12:59:53.058 -04:00] [INF] [1] Main: User Interactive: True
[2025-04-25 12:59:53.060 -04:00] [INF] [1] Main: Processor count: 8
[2025-04-25 12:59:53.063 -04:00] [INF] [1] Main: Program data path: "C:\ProgramData\Jellyfin\ServerData"
[2025-04-25 12:59:53.066 -04:00] [INF] [1] Main: Log directory path: "C:\ProgramData\Jellyfin\ServerData\log"
[2025-04-25 12:59:53.069 -04:00] [INF] [1] Main: Config directory path: "C:\ProgramData\Jellyfin\ServerData\config"
[2025-04-25 12:59:53.072 -04:00] [INF] [1] Main: Cache path: "C:\ProgramData\Jellyfin\ServerData\cache"
[2025-04-25 12:59:53.074 -04:00] [INF] [1] Main: Temp directory path: "C:\Users\Travis\AppData\Local\Temp\jellyfin"
[2025-04-25 12:59:53.077 -04:00] [INF] [1] Main: Web resources path: "C:\Program Files\Jellyfin\jellyfin-web"
[2025-04-25 12:59:53.080 -04:00] [INF] [1] Main: Application directory: "C:\Program Files\Jellyfin\"
[2025-04-25 12:59:53.630 -04:00] [INF] [1] Emby.Server.Implementations.AppBase.BaseConfigurationManager: Setting cache path: "C:\ProgramData\Jellyfin\ServerData\cache"
[2025-04-25 12:59:54.157 -04:00] [INF] [1] Emby.Server.Implementations.ApplicationHost: Loading assemblies
[2025-04-25 12:59:54.362 -04:00] [INF] [1] Emby.Server.Implementations.Plugins.PluginManager: Loaded assembly "Jellyfin.Plugin.FileTransformation, Version=2.2.2.0, Culture=neutral, PublicKeyToken=null" from "C:\ProgramData\Jellyfin\ServerData\plugins\File Transformation_2.2.2.0\Jellyfin.Plugin.FileTransformation.dll"
[2025-04-25 12:59:54.388 -04:00] [INF] [1] Emby.Server.Implementations.Plugins.PluginManager: Loaded assembly "IntroSkipper, Version=1.10.10.17, Culture=neutral, PublicKeyToken=null" from "C:\ProgramData\Jellyfin\ServerData\plugins\Intro Skipper_1.10.10.17\IntroSkipper.dll"
[2025-04-25 12:59:54.397 -04:00] [INF] [1] Emby.Server.Implementations.Plugins.PluginManager: Loaded assembly "Jellyfin.Plugin.LocalIntros, Version=3.0.0.0, Culture=neutral, PublicKeyToken=null" from "C:\ProgramData\Jellyfin\ServerData\plugins\Local Intros_3.0.0.0\Jellyfin.Plugin.LocalIntros.dll"
[2025-04-25 12:59:54.406 -04:00] [INF] [1] Emby.Server.Implementations.Plugins.PluginManager: Loaded assembly "Jellyfin.Plugin.MediaBar, Version=2.2.5.0, Culture=neutral, PublicKeyToken=null" from "C:\ProgramData\Jellyfin\ServerData\plugins\Media Bar_2.2.5.0\Jellyfin.Plugin.MediaBar.dll"
[2025-04-25 12:59:54.415 -04:00] [INF] [1] Emby.Server.Implementations.Plugins.PluginManager: Loaded assembly "Jellyfin.Plugin.Simkl, Version=6.0.0.0, Culture=neutral, PublicKeyToken=null" from "C:\ProgramData\Jellyfin\ServerData\plugins\Simkl_6.0.0.0\Jellyfin.Plugin.Simkl.dll"
[2025-04-25 12:59:54.556 -04:00] [INF] [1] Jellyfin.Networking.Manager.NetworkManager: Defined LAN subnets: ["127.0.0.1/8", "10.0.0.0/8", "172.16.0.0/12", "192.168.0.0/16"]
[2025-04-25 12:59:54.562 -04:00] [INF] [1] Jellyfin.Networking.Manager.NetworkManager: Defined LAN exclusions: []
[2025-04-25 12:59:54.565 -04:00] [INF] [1] Jellyfin.Networking.Manager.NetworkManager: Used LAN subnets: ["127.0.0.1/8", "10.0.0.0/8", "172.16.0.0/12", "192.168.0.0/16"]
[2025-04-25 12:59:54.574 -04:00] [INF] [1] Jellyfin.Networking.Manager.NetworkManager: Filtered interface addresses: ["10.72.60.152", "192.168.2.16", "127.0.0.1"]
[2025-04-25 12:59:54.579 -04:00] [INF] [1] Jellyfin.Networking.Manager.NetworkManager: Bind Addresses ["0.0.0.0"]
[2025-04-25 12:59:54.583 -04:00] [INF] [1] Jellyfin.Networking.Manager.NetworkManager: Remote IP filter is "Allowlist"
[2025-04-25 12:59:54.586 -04:00] [INF] [1] Jellyfin.Networking.Manager.NetworkManager: Filtered subnets: []
[2025-04-25 12:59:58.133 -04:00] [INF] [1] Emby.Server.Implementations.Plugins.PluginManager: Loaded plugin: "File Transformation" "2.2.2.0"
[2025-04-25 12:59:58.456 -04:00] [INF] [1] Emby.Server.Implementations.Plugins.PluginManager: Loaded plugin: "Intro Skipper" "1.10.10.17"
[2025-04-25 12:59:58.460 -04:00] [INF] [1] Emby.Server.Implementations.Plugins.PluginManager: Loaded plugin: "Local Intros" "3.0.0.0"
[2025-04-25 12:59:58.465 -04:00] [INF] [1] Emby.Server.Implementations.Plugins.PluginManager: Loaded plugin: "Media Bar" "2.2.5.0"
[2025-04-25 12:59:58.469 -04:00] [INF] [1] Emby.Server.Implementations.Plugins.PluginManager: Loaded plugin: "Simkl" "6.0.0.0"
[2025-04-25 12:59:58.472 -04:00] [INF] [1] Emby.Server.Implementations.Plugins.PluginManager: Loaded plugin: "TMDb" "10.10.7.0"
[2025-04-25 12:59:58.476 -04:00] [INF] [1] Emby.Server.Implementations.Plugins.PluginManager: Loaded plugin: "Studio Images" "10.10.7.0"
[2025-04-25 12:59:58.479 -04:00] [INF] [1] Emby.Server.Implementations.Plugins.PluginManager: Loaded plugin: "OMDb" "10.10.7.0"
[2025-04-25 12:59:58.498 -04:00] [INF] [1] Emby.Server.Implementations.Plugins.PluginManager: Loaded plugin: "MusicBrainz" "10.10.7.0"
[2025-04-25 12:59:58.502 -04:00] [INF] [1] Emby.Server.Implementations.Plugins.PluginManager: Loaded plugin: "AudioDB" "10.10.7.0"
[2025-04-25 12:59:58.635 -04:00] [INF] [1] Main: Kestrel is listening on "0.0.0.0"
[2025-04-25 12:59:58.679 -04:00] [INF] [1] IntroSkipper.Services.Entrypoint: Running startup enqueue
[2025-04-25 12:59:58.796 -04:00] [INF] [1] IntroSkipper.Manager.QueueManager: Running enqueue of items in library "Bluu Shows"
[2025-04-25 12:59:59.094 -04:00] [INF] [1] IntroSkipper.Manager.QueueManager: Running enqueue of items in library "Collections"
[2025-04-25 12:59:59.098 -04:00] [INF] [1] IntroSkipper.Manager.QueueManager: Running enqueue of items in library "RRed Movies"
[2025-04-25 12:59:59.700 -04:00] [ERR] [1] Microsoft.Extensions.Hosting.Internal.Host: Hosting failed to start
System.Net.Sockets.SocketException (10013): An attempt was made to access a socket in a way forbidden by its access permissions.
  at System.Net.Sockets.Socket.UpdateStatusAfterSocketErrorAndThrowException(SocketError error, Boolean disconnectOnFailure, String callerName)
  at System.Net.Sockets.Socket.Listen(Int32 backlog)
  at Microsoft.AspNetCore.Server.Kestrel.Transport.Sockets.SocketConnectionListener.Bind()
  at Microsoft.AspNetCore.Server.Kestrel.Transport.Sockets.SocketTransportFactory.BindAsync(EndPoint endpoint, CancellationToken cancellationToken)
  at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Infrastructure.TransportManager.BindAsync(EndPoint endPoint, ConnectionDelegate connectionDelegate, EndpointConfig endpointConfig, CancellationToken cancellationToken)
  at Microsoft.AspNetCore.Server.Kestrel.Core.KestrelServerImpl.<>c__DisplayClass28_01.<<StartAsync>g__OnBind|0>d.MoveNext()
--- End of stack trace from previous location ---
  at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.AddressBinder.BindEndpointAsync(ListenOptions endpoint, AddressBindContext context, CancellationToken cancellationToken)
  at Microsoft.AspNetCore.Server.Kestrel.Core.ListenOptions.BindAsync(AddressBindContext context, CancellationToken cancellationToken)
  at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.AddressBinder.EndpointsStrategy.BindAsync(AddressBindContext context, CancellationToken cancellationToken)
  at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.AddressBinder.BindAsync(ListenOptions[] listenOptions, AddressBindContext context, Func2 useHttps, CancellationToken cancellationToken)
  at Microsoft.AspNetCore.Server.Kestrel.Core.KestrelServerImpl.BindAsync(CancellationToken cancellationToken)
  at Microsoft.AspNetCore.Server.Kestrel.Core.KestrelServerImpl.StartAsync[TContext](IHttpApplication1 application, CancellationToken cancellationToken)
  at Microsoft.AspNetCore.Hosting.GenericWebHostService.StartAsync(CancellationToken cancellationToken)
  at Microsoft.Extensions.Hosting.Internal.Host.<StartAsync>b__15_1(IHostedService service, CancellationToken token)
  at Microsoft.Extensions.Hosting.Internal.Host.ForeachService[T](IEnumerable1 services, CancellationToken token, Boolean concurrent, Boolean abortOnFirstException, List1 exceptions, Func3 operation)
  at Microsoft.Extensions.Hosting.Internal.Host.StartAsync(CancellationToken cancellationToken)
  at Jellyfin.Server.Program.StartServer(IServerApplicationPaths appPaths, StartupOptions options, IConfiguration startupConfig)
[2025-04-25 12:59:59.709 -04:00] [ERR] [1] Main: Kestrel failed to start! This is most likely due to an invalid address or port bind - correct your bind configuration in network.xml and try again
[2025-04-25 12:59:59.710 -04:00] [FTL] [1] Main: Error while starting server
System.Net.Sockets.SocketException (10013): An attempt was made to access a socket in a way forbidden by its access permissions.
  at System.Net.Sockets.Socket.UpdateStatusAfterSocketErrorAndThrowException(SocketError error, Boolean disconnectOnFailure, String callerName)
  at System.Net.Sockets.Socket.Listen(Int32 backlog)
  at Microsoft.AspNetCore.Server.Kestrel.Transport.Sockets.SocketConnectionListener.Bind()
  at Microsoft.AspNetCore.Server.Kestrel.Transport.Sockets.SocketTransportFactory.BindAsync(EndPoint endpoint, CancellationToken cancellationToken)
  at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Infrastructure.TransportManager.BindAsync(EndPoint endPoint, ConnectionDelegate connectionDelegate, EndpointConfig endpointConfig, CancellationToken cancellationToken)
  at Microsoft.AspNetCore.Server.Kestrel.Core.KestrelServerImpl.<>c__DisplayClass28_01.<<StartAsync>g__OnBind|0>d.MoveNext()
--- End of stack trace from previous location ---
  at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.AddressBinder.BindEndpointAsync(ListenOptions endpoint, AddressBindContext context, CancellationToken cancellationToken)
  at Microsoft.AspNetCore.Server.Kestrel.Core.ListenOptions.BindAsync(AddressBindContext context, CancellationToken cancellationToken)
  at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.AddressBinder.EndpointsStrategy.BindAsync(AddressBindContext context, CancellationToken cancellationToken)
  at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.AddressBinder.BindAsync(ListenOptions[] listenOptions, AddressBindContext context, Func2 useHttps, CancellationToken cancellationToken)
  at Microsoft.AspNetCore.Server.Kestrel.Core.KestrelServerImpl.BindAsync(CancellationToken cancellationToken)
  at Microsoft.AspNetCore.Server.Kestrel.Core.KestrelServerImpl.StartAsync[TContext](IHttpApplication1 application, CancellationToken cancellationToken)
  at Microsoft.AspNetCore.Hosting.GenericWebHostService.StartAsync(CancellationToken cancellationToken)
  at Microsoft.Extensions.Hosting.Internal.Host.<StartAsync>b__15_1(IHostedService service, CancellationToken token)
  at Microsoft.Extensions.Hosting.Internal.Host.ForeachService[T](IEnumerable1 services, CancellationToken token, Boolean concurrent, Boolean abortOnFirstException, List1 exceptions, Func3 operation)
  at Microsoft.Extensions.Hosting.Internal.Host.StartAsync(CancellationToken cancellationToken)
  at Jellyfin.Server.Program.StartServer(IServerApplicationPaths appPaths, StartupOptions options, IConfiguration startupConfig)
[2025-04-25 12:59:59.779 -04:00] [INF] [1] Main: Running query planner optimizations in the database... This might take a while
[2025-04-25 12:59:59.792 -04:00] [INF] [1] Emby.Server.Implementations.ApplicationHost: Disposing "CoreAppHost"
[2025-04-25 12:59:59.795 -04:00] [INF] [1] Emby.Server.Implementations.ApplicationHost: Disposing "MusicBrainzArtistProvider"
[2025-04-25 12:59:59.798 -04:00] [INF] [1] Emby.Server.Implementations.ApplicationHost: Disposing "MusicBrainzAlbumProvider"
[2025-04-25 12:59:59.801 -04:00] [INF] [1] Emby.Server.Implementations.ApplicationHost: Disposing "PluginManager"