Exactly the problem is in the udpfromto_init() call inside the listen_bind() function. Inside this function the return value is set to be: return setsockopt(s, proto, flag, &opt, sizeof(opt)); with the ipv6 address, it returns -1 (and after a couple of calls and error logs, the program exits) with the ipv4 address it returns the correct 0 value. - List info/subscribe/unsubscribe? See http://www.freeradius.org/list/users.html
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