Can't read/write virtual plc when running it from Docker

[emmanuelbertho]

Hello, I am trying your virtual-plc and I have an issue.
When I start the program on my machine everything works fine and I can read and write values in ADS.
But when I am starting it in Docker, I can't read and write values in my plc. I have an exception : TwinCAT.Ads.AdsErrorException : 'Target port could not be found. (AdsErrorCode: 6, 0x6)'

Here is the log of my container :

dbug: TwinCAT.Ads.AdsRouterService.RouterService[0]
Application Directories
dbug: TwinCAT.Ads.AdsRouterService.RouterService[0]
=======================
dbug: TwinCAT.Ads.AdsRouterService.RouterService[0]
ApplicationPath: /app/SoftBeckhoff.dll
dbug: TwinCAT.Ads.AdsRouterService.RouterService[0]
BaseDirectory: /app/
dbug: TwinCAT.Ads.AdsRouterService.RouterService[0]
CurrentDirectory: /app
dbug: TwinCAT.Ads.AdsRouterService.RouterService[0]
Configuration
dbug: TwinCAT.Ads.AdsRouterService.RouterService[0]
=============
dbug: TwinCAT.Ads.AdsRouterService.RouterService[0]
ASPNETCORE_ENVIRONMENT: Production
Provider: ChainedConfigurationProvider
Provider: JsonConfigurationProvider
Provider: JsonConfigurationProvider
Provider: EnvironmentVariablesConfigurationProvider
Provider: CommandLineConfigurationProvider
Provider: JsonConfigurationProvider
Local System: SoftBeckhoff, 192.168.1.20.1.1, 172.17.0.5

Configured routes:
RemoteSystem1, 10.30.2.124.1.1, RemoteSystem1

dbug: TwinCAT.Ads.AdsRouterService.RouterService[0]
Starting remote listeners ...
dbug: TwinCAT.Ads.AdsRouterService.RouterService[0]
Starting listening on 172.17.0.5:48898
dbug: TwinCAT.Ads.AdsRouterService.RouterService[0]
Waiting for Request to AmsTcpIpRouter (192.168.1.20.1.1)
dbug: TwinCAT.Ads.AdsRouterService.RouterService[0]
[AmsTcpIpRouter] Start Listener
dbug: TwinCAT.Ads.AdsRouterService.RouterService[0]
Opening Loopback listener '127.0.0.1:48898'
dbug: TwinCAT.Ads.AdsRouterService.RouterService[0]
[AmsTcpIpRouter] Start Listener
info: Microsoft.Hosting.Lifetime[0]
Now listening on: http://[::]:80
info: Microsoft.Hosting.Lifetime[0]
Application started. Press Ctrl+C to shut down.
info: Microsoft.Hosting.Lifetime[0]
Hosting environment: Production
info: Microsoft.Hosting.Lifetime[0]
Content root path: /app
info: SoftBeckhoff.Services.BeckhoffService[0]
Initializing Beckhoff server...
info: SoftBeckhoff.Services.BeckhoffService[0]
Beckhoff server created
dbug: TwinCAT.Ads.AdsRouterService.RouterService[0]
Opening Loopback listener '127.0.0.1:48898'
dbug: TwinCAT.Ads.AdsRouterService.RouterService[0]
[AmsTcpIpRouter] Start Listener
dbug: TwinCAT.Ads.AdsRouterService.RouterService[0]
[AmsTcpIpRouter] TCP Connect Endpoint: 127.0.0.1:37776
dbug: TwinCAT.Ads.AdsRouterService.RouterService[0]
Port '852' occupied!
info: TwinCAT.Ads.AdsRouterService.RouterService[0]
AdsServer with AmsPort '192.168.1.20.1.1:65535' registered!
dbug: TwinCAT.Ads.AdsRouterService.RouterService[0]
Starting Receive AdsServer '192.168.1.20.1.1:65535 (Endpoint: 127.0.0.1:37776)' registered!
dbug: TwinCAT.Ads.AdsRouterService.RouterService[0]
--> Sending Frame: TcpFrame Flags: PortConnect, DataSize: 8 (TcpFrameSize: 14)
dbug: TwinCAT.Ads.AdsRouterService.RouterService[0]
--> Send TcpFrame: TcpFrame Flags: PortConnect, DataSize: 8 (TcpFrameSize: 14)
info: TwinCAT.Ads.AdsRouterService.RouterService[0]
AdsServer '192.168.1.20.1.1:852' connected! (2 loopback connections active)
info: SoftBeckhoff.Services.BeckhoffService[0]
Beckhoff server connected = True with result = 852
info: Microsoft.Hosting.Lifetime[0]
Application is shutting down...
dbug: TwinCAT.Ads.AdsRouterService.RouterService[0]
A task was canceled.
dbug: TwinCAT.Ads.AdsRouterService.RouterService[0]
[AmsTcpIpRouter] TCP Disconnect Endpoint: 127.0.0.1:37776
dbug: TwinCAT.Ads.AdsRouterService.RouterService[0]
Loopback listener '127.0.0.1:48898' closed!

Do you know what could cause that ?