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Yes, your request from outside gets blocked by iptables, I can clearly see it if the rules.
 Please notice that telnet with hostname does not work while with IP address it works:
... in the config file I put explicitly IP ( all.manager 140.247.236.34:1213)
And if I start container on dtn17 with older version it works. The only way I can explain what I see is that the way cmsd does things was changed. My speculation is that it used to resolve hostname to ip (either ipv4 or ipv6) but now just goes ahead with hostname straight up.

Anyway, I need to make it work somehow, it sounds to me that what you are saying is: 'make sure telnet with hostname on that port works'. Or there is anything else I can do?

[maxi@dtn17 ~]$ telnet dtn20.nese.rc.fas.harvard.edu 1213
Trying 10.255.125.103...
telnet: connect to address 10.255.125.103: Connection refused
[maxi@dtn17 ~]$ telnet 140.247.236.34 1213
Trying 140.247.236.34...
Connected to 140.247.236.34.
Escape character is '^]'.
Connection closed by foreign host.


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