[wildfly-dev] Intra-process connections to ephemeral ports

[Luís M. Costa]

I've be doing some tests with WF 10.

I've noticed that are some connections being established intra-process to
and from ephemeral ports. This is without having any application deployed.

C:\>netstat -nao | findstr 28692
  TCP    127.0.0.1:8280         0.0.0.0:0              LISTENING       28692
  TCP    127.0.0.1:10190        0.0.0.0:0              LISTENING       28692
  TCP    127.0.0.1:64778        127.0.0.1:64779        ESTABLISHED     28692
  TCP    127.0.0.1:64779        127.0.0.1:64778        ESTABLISHED     28692
  TCP    127.0.0.1:64780        127.0.0.1:64781        ESTABLISHED     28692
  TCP    127.0.0.1:64781        127.0.0.1:64780        ESTABLISHED     28692
  TCP    127.0.0.1:64782        127.0.0.1:64783        ESTABLISHED     28692
  TCP    127.0.0.1:64783        127.0.0.1:64782        ESTABLISHED     28692
  TCP    127.0.0.1:64784        127.0.0.1:64785        ESTABLISHED     28692
  TCP    127.0.0.1:64785        127.0.0.1:64784        ESTABLISHED     28692
  TCP    127.0.0.1:64786        127.0.0.1:64787        ESTABLISHED     28692
  TCP    127.0.0.1:64787        127.0.0.1:64786        ESTABLISHED     28692
  TCP    127.0.0.1:64788        127.0.0.1:64789        ESTABLISHED     28692
  TCP    127.0.0.1:64789        127.0.0.1:64788        ESTABLISHED     28692
  TCP    127.0.0.1:64790        127.0.0.1:64791        ESTABLISHED     28692
  TCP    127.0.0.1:64791        127.0.0.1:64790        ESTABLISHED     28692
  TCP    127.0.0.1:64792        127.0.0.1:64793        ESTABLISHED     28692
  TCP    127.0.0.1:64793        127.0.0.1:64792        ESTABLISHED     28692

*Setup*
Wildfly 10 final (just downloaded / no applications deployed / port
offset:150)
Windows 7 64bits
Java 8u20

Can someone clarify why is this happening? Or provide some troubleshooting
tips?

*Connection pattern*
Using WinCap I was able to identify the communication pattern:
Client Connects [SYN]
Server Ack [SYN, ACK]
Client Ack [ACK]
Client Push [PSH] - It pushes 8 bytes (e.g., in hex, e6202552f2b95f6f)
Optionally the server pushes some data periodically (always the same)
Server Push [PSH] - It pushes 1 bytes (in hex, 1)


I've reported a problem related with this in the user's forum, but I still
don't have a answer.
Link: https://developer.jboss.org/message/953900

Thanks,
Luís M. Costa
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