Getting "connection reset by peer" when attempting to connect to a private app

Hello. I’m attempting to send a request to a private ipv6 app (http://[fdaa:9:7823:0:1::d0]:65432/scanDirectory) from my main app , but I get “connection reset by peer” when I try to do so. This used to work until today.
As a note, today I switched the location of my MAIN app’s machines from otp (Bucharest) to fra (Frankfurt) - but I also get the same problems when attempting to connect to the private apps via the fly wireguard proxy, so I doubt that’s causing the issue.

Here are some commands I’ve ran regarding the private ipv6 app:

fly services list -a ab76dbfc-70af-49b6-80c7-f1dfa76f0389

Services
PROTOCOL	PORTS         	HANDLERS	FORCE HTTPS	PROCESS GROUP	REGIONS	MACHINES 
        	65432 => 65432	[]      	False      	             	fra    	1
fly ssh console -a ab76dbfc-70af-49b6-80c7-f1dfa76f0389 --machine 28659e1c41ee98 -C "netstat -an"

Connecting to fdaa:f:857a:a7b:1c1:eb43:29a0:2... complete
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address           Foreign Address         State      
tcp6       0      0 fdaa:f:857a:a7b:1c1::22 :::*                    LISTEN     
tcp6       0      0 :::65432                :::*                    LISTEN     
tcp6       0     36 fdaa:f:857a:a7b:1c1::22 fdaa:f:857a:a7b:1:60648 ESTABLISHED
Active UNIX domain sockets (servers and established)
Proto RefCnt Flags       Type       State         I-Node   Path
unix  2      [ ACC ]     STREAM     LISTENING     1165     /.fly/api
unix  2      [ ACC ]     STREAM     LISTENING     1178     /tmp/dotnet-diagnostic-626-116-socket
unix  3      [ ]         STREAM     CONNECTED     1141     
unix  3      [ ]         STREAM     CONNECTED     1140  

The IP is correct:

I am creating the machine using the following JSON:

{
  "name" : "ab76dbfc-70af-49b6-80c7-f1dfa76f0389",
  "skip_launch" : false,
  "config" : {
    "image" : redacted,
    "env" : {
      "APP_ENV" : "production"
    },
    "services" : [ {
      "internal_port" : 65432,
      "autostop" : "off",
      "autostart" : true,
      "ports" : [ {
        "port" : 65432
      } ]
    } ],
    "auto_destroy" : false,
    "guest" : {
      "cpu_kind" : "shared",
      "cpus" : 1,
      "memory_mb" : 512
    }
  }
}

Same issue, now fixed: Fly not sending traffic to my apps anymore? - #9 by miend

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