Remote Ruby SshjSshConnection Fatal Error in RubyMine and Not Fatal in Intellij IDE

The same project with remote Ruby with rbenv and Rails 4 using SSH/sftp succeeds in IntellliJ 2018.3.1 succeeds (but with errors in idea.log), but fails in RubyMine 2019.2.1 and 2019.2 starting Deployment Run or Debug in any mode.

• sftp testing succeeds in settings.
• Guest/Host Port binding 3000

RubyMine Deployment fails with this logs:

Output in IDE:

Error running 'Development': Failed to create local tunnel for SshjSshConnection(<crc32=bie7tb>@localhost)@108601b9: localhost:3000 <== localhost:3000: Address already in use: NET_Bind

Logs:

(2019-08-23 14:15:42,869 [ 20726] WARN - nsight.nativerb.StubsGenRunner - Unable to build stubs for remote sdk: Remote: ruby-2.5.5-p157: ver.2.5.5p157 ( revision 67260) p157 (ssh://xxxx@localhost:yyy/opt/rbenv/versions/2.5.5/bin/ruby) 

2019-08-23 14:16:26,561 [ 64418] INFO - .channel.direct.SessionChannel - Will request `sftp` subsystem
2019-08-23 14:16:26,734 [ 64591] INFO - emote.RubyRemoteProcessHandler - Adding new tunnel - Port forwarding[from remote server 127.0.0.1:3000 to local localhost:3000]
2019-08-23 14:16:26,736 [ 64593] WARN - om.intellij.ssh.impl.sshj.sshj - Failed to create local tunnel for SshjSshConnection(<crc32=bie7tb>@localhost)@108601b9: localhost:3000 <== localhost:3000: Address already in use: NET_Bind
java.net.BindException: Address already in use: NET_Bind
at java.base/java.net.PlainSocketImpl.bind0(Native Method)
at java.base/java.net.PlainSocketImpl.socketBind(PlainSocketImpl.java:132)

Intellij Deployment succeeds, with this logs:

IntelliJ idea.log:

2019-08-23 14:03:46,133 [ 29949] WARN - nsight.nativerb.StubsGenRunner - Unable to build stubs for remote sdk: Remote: ruby-2.5.5-p157: ver.2.5.5p157 ( revision 67260) p157 (ssh://xxx@localhost:xx/opt/rbenv/versions/2.5.5/bin/ruby)
2019-08-23 14:03:47,270 [ 31086] INFO - emote.RubyRemoteProcessHandler - Adding new tunnel - Port forwarding[from remote server localhost:34296 to local localhost:49473]
2019-08-23 14:03:47,272 [ 31088] INFO - emote.RubyRemoteProcessHandler - Adding new tunnel - Port forwarding[from local server localhost:49474 to remote localhost:48758]
2019-08-23 14:03:47,275 [ 31091] INFO - emote.RubyRemoteProcessHandler - Adding new tunnel - Port forwarding[from remote server 127.0.0.1:3000 to local localhost:3000]
2019-08-23 14:03:47,276 [ 31092] WARN - n.RubyAbstractCommandLineState - Unable to add tunnel
com.intellij.remote.RemoteSdkException: Failed to add local port forwarding
at com.intellij.ssh.process.SshProcess.addLocalTunnel(SshProcess.java:101)
at org.jetbrains.plugins.ruby.remote.RubyRemoteProcessHandler.addTunnel(RubyRemoteProcessHandler.java:64)
at org.jetbrains.plugins.ruby.ruby.run.configuration.RubyAbstractCommandLineState.createCommandLineAndProcessHan

[same cause as below]

2019-08-23 14:06:23,529 [ 187345] INFO - emote.RubyRemoteProcessHandler - processWillTerminate: removing port forwarding - Port forwarding[from remote server localhost:34296 to local localhost:49473]
2019-08-23 14:06:46,664 [ 210480] INFO - emote.RubyRemoteProcessHandler - Adding new tunnel - Port forwarding[from remote server localhost:41837 to local localhost:49981]
2019-08-23 14:06:46,664 [ 210480] INFO - emote.RubyRemoteProcessHandler - Adding new tunnel - Port forwarding[from local server localhost:49982 to remote localhost:56691]
2019-08-23 14:06:46,666 [ 210482] INFO - emote.RubyRemoteProcessHandler - Adding new tunnel - Port forwarding[from remote server 0.0.0.0:3000 to local localhost:3000]
2019-08-23 14:06:46,667 [ 210483] WARN - n.RubyAbstractCommandLineState - Unable to add tunnel
com.intellij.remote.RemoteSdkException: Failed to add local port forwarding
at com.intellij.ssh.process.SshProcess.addLocalTunnel(SshProcess.java:101)
at org.jetbrains.plugins.ruby.remote.RubyRemoteProcessHandler.addTunnel(RubyRemoteProcessHandler.java:64)
at org.jetbrains.plugins.ruby.ruby.run.configuration.RubyAbstractCommandLineState.createCommandLineAndProcessHandler(RubyAbstractCommandLineState.java:163)
at org.jetbrains.plugins.ruby.rails.run.configuration.server.RailsServerRunCommandLineState.createCommandLineAndProcessHandler(RailsServerRunCommandLineState.java:136)
at org.jetbrains.plugins.ruby.ruby.debugger.RubyDebugRunner$RubyDebugSessionBuilder.<init>(RubyDebugRunner.java:185)
....

aused by: com.intellij.ssh.SshTransportException: Failed to add local port forwarding
at com.intellij.ssh.SshSession.addLocalTunnel(SshSession.kt:48)
at com.intellij.ssh.process.SshProcess.addLocalTunnel(SshProcess.java:98)
... 51 more
Caused by: com.jcraft.jsch.JSchException: PortForwardingL: local port 127.0.0.1:3000 cannot be bound.
at com.jcraft.jsch.PortWatcher.<init>(PortWatcher.java:158)
at com.jcraft.jsch.PortWatcher.addPort(PortWatcher.java:110)
at com.jcraft.jsch.Session.setPortForwardingL(Session.java:1847)
at com.jcraft.jsch.Session.setPortForwardingL(Session.java:1828)
at com.jcraft.jsch.Session.setPortForwardingL(Session.java:1809)
at com.jcraft.jsch.Session.setPortForwardingL(Session.java:1792)
at com.intellij.ssh.SshSession.addLocalTunnel(SshSession.kt:45)
... 52 more
Caused by: java.net.BindException: Address already in use: JVM_Bind
at java.net.TwoStacksPlainSocketImpl.socketBind(Native Method)
at java.net.TwoStacksPlainSocketImpl.socketBind(TwoStacksPlainSocketImpl.java:137)
at java.net.AbstractPlainSocketImpl.bind(AbstractPlainSocketImpl.java:387)
at java.net.TwoStacksPlainSocketImpl.bind(TwoStacksPlainSocketImpl.java:110)
at java.net.PlainSocketImpl.bind(PlainSocketImpl.java:190)
at java.net.ServerSocket.bind(ServerSocket.java:375)

Apparently the connection to the remote/guest system seems to fail in both cases - but not really fatal, as IntelliJ could execute the remote commands! False positives?!