Unable to connect to Remote Connection Server with TLS

Hello,

I set up 2 Remote Connection Servers (RCS) for my repository. One without TLS 8080 and one with TLS auth required 4433.
I have no problem connecting to the Server over 8080. However, once I try to connect to the RCS with TLS I get:

The Monitor was unable to connect to the specified server (<ip>:4433).

Failed to establish connection to <ip>:4433 due to a communication error.
 ---> System.Security.Authentication.AuthenticationException: The remote certificate was rejected by the provided RemoteCertificateValidationCallback.
   at System.Net.Security.SslStream.SendAuthResetSignal(ReadOnlySpan`1 alert, ExceptionDispatchInfo exception)
   at System.Net.Security.SslStream.CompleteHandshake(SslAuthenticationOptions sslAuthenticationOptions)
   at System.Net.Security.SslStream.ForceAuthenticationAsync[TIOAdapter](Boolean receiveFirst, Byte[] reAuthenticationData, CancellationToken cancellationToken)
   at System.Net.Http.ConnectHelper.EstablishSslConnectionAsync(SslClientAuthenticationOptions sslOptions, HttpRequestMessage request, Boolean async, Stream stream, CancellationToken cancellationToken)
   --- End of inner exception stack trace ---
   at Deadline.Controllers.RemoteDataController..ctor(RepositoryConnectionSettings settings)
   at Deadline.Applications.DeadlineApplicationManager.CreateDataController(RepositoryConnectionSettings connSettings)
   at Deadline.Applications.DeadlineApplicationManager.Connect(RepositoryConnectionSettings connSettings, Boolean updateScriptManager)
   at Deadline.Monitor.MonitorManager.Connect(RepositoryConnectionSettings connectionSettings, Boolean updateScriptManager)
   at InvokeStub_MonitorManager.Connect(Object, Span`1)
   at System.Reflection.MethodBaseInvoker.InvokeWithFewArgs(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)

The Deadline console also doesn’t have any helpful error:

ERROR: UpdateClient.MaybeSendRequestNow caught an exception: POST https://<ip>:4433/rcs/v1/update returned "One or more errors occurred. (The SSL connection could not be established, see inner exception.)" (Deadline.Net.Clients.Http.DeadlineHttpRequestException)
ERROR: DataController threw a configuration exception during initialization: Failed to establish connection to <ip>:4433 due to a communication error. (Deadline.Configuration.DeadlineConfigException)

I have ensured that the port is open with nc -zv <ip> 4433.

I have ensured that I am using the certificates that were generated when installing the RCS:
/opt/Thinkbox/Deadline10/certs/Deadline10RemoteClient.pfx

The RCS server command does not have any information about any connection attempt even when running --verbose 5 (unsure about what values to use for verbose…).

The RCS uses this deadline.ini configuration:

[Deadline]
HttpListenPort=8080
TlsListenPort=4433
TlsServerCert=/opt/Thinkbox/Deadline10/certs/rcs.pfx
TlsCaCert=/opt/Thinkbox/Deadline10/certs/ca.crt
TlsAuth=True
LaunchRemoteConnectionServerAtStartup=True
KeepRemoteConnectionServerRunning=True
LicenseMode=LicenseFree
Region=
LauncherListeningPort=17000
LauncherServiceStartupDelay=60
AutoConfigurationPort=17001
SlaveStartupPort=17003
SlaveDataRoot=
RestartStalledSlave=false
NoGuiMode=true
LaunchSlaveAtStartup=false
AutoUpdateOverride=
IncludeRCSInLauncherMenu=true
RemoteControl=Blocked
ConnectionType=Direct
NetworkRoot=/opt/Thinkbox/DeadlineRepository10
DbSSLCertificate=

Does anyone have any ideas on how to troubleshoot this?

Thank you,
Beat