Regarding check_mk_agent on AIX 7.3

OK. Here’s some troubleshooting information. Hope this is useful in order to point me in the right direction. Again, I’m not familiar on AIX but I have to perform the troubleshooting because I’m the guy for Checkmk related matters.

  1. My first test is to telnet to port 6556 on the remote server from my checkmk server. Since it took a long time, I cancelled it and nmap instead. Nmap tell me that port 6556 on remote host is filtered. Which suggests possible firewall issues.
  2. So I went to the NetSec team. To cut tory short, they came back to inform that issue is on the remote server because when they tested, the remote host is resetting the connection.
  3. On a Known-Good AIX server where Checkmk is working as expected, when i execute command netstat -an | grep 6556, I got an output that says something is listening on port 6556. However, on the problematic remote server, it output nothing.

Does anyone know what’s going on ?