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When I set up a bootstrap server in aws ECS frontend by NLB, or Ec2, and run client locally, I get an error below,

See original GitHub issue

11:27:44.002 [UDP-Sender-localhost/127.0.0.1:0[0]] DEBUG org.eclipse.californium.elements.UDPConnector - UDPConnector (Thread[UDP-Sender-localhost/127.0.0.1:0[0],5,Californium/Elements]) sent 120 bytes to ztd-coap-nlb-f9adbad5e5c4bbcd.elb.us-west-1.amazonaws.com/54.176.11.0:5684
11:27:44.002 [CoapServer(main)#1] DEBUG org.eclipse.californium.core.network.Exchange - local Exchange[L1, complete] completed CON-POST   MID=58500, Token=F8CCB2FEC737AF83, OptionSet={"Uri-Path":"bs", "Uri-Query":["pct=112","ep=localhost","deviceId=ODkwMTE3MDMyNzgyODg3Nzc1NjE6MzU0NzYyMTE0MDc5ODQwMQ%3D%3D","ip=72.163.220.9"]}, canceled <empty data>!
11:27:44.001 [RegistrationEngine#0] WARN org.eclipse.leshan.client.engine.DefaultRegistrationEngine - Unable to send Bootstrap request
org.eclipse.leshan.core.request.exception.SendFailedException: Request CON-POST   MID=58500, Token=F8CCB2FEC737AF83, OptionSet={"Uri-Path":"bs", "Uri-Query":["pct=112","ep=localhost","deviceId=ODkwMTE3MDMyNzgyODg3Nzc1NjE6MzU0NzYyMTE0MDc5ODQwMQ%3D%3D","ip=72.163.220.9"]}, Can't assign requested address <empty data> cannot be sent
	at org.eclipse.leshan.core.californium.CoapSyncRequestObserver.onSendError(CoapSyncRequestObserver.java:106)
	at org.eclipse.californium.core.coap.Message.setSendError(Message.java:1026)
	at org.eclipse.californium.core.coap.Request.setSendError(Request.java:1046)
	at org.eclipse.californium.core.network.CoapEndpoint$SendingCallback.onError(CoapEndpoint.java:1246)
	at org.eclipse.californium.elements.RawData.onError(RawData.java:314)
	at org.eclipse.californium.elements.UDPConnector$Sender.work(UDPConnector.java:518)
	at org.eclipse.californium.elements.UDPConnector$NetworkStageThread.run(UDPConnector.java:434)
Caused by: java.io.IOException: Can't assign requested address
	at java.base/java.net.PlainDatagramSocketImpl.send(Native Method)
	at java.base/java.net.DatagramSocket.send(DatagramSocket.java:695)
	at org.eclipse.californium.elements.UDPConnector$Sender.work(UDPConnector.java:515)
	... 1 common frames omitted