"refused connect from 0.0.0.0"

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If using TCP Wrappers, this error may mean that you are attempting to wrap an IPv6 service with a tcpd that only supports IPv4. As a fix, install the TCP Wrappers IPv6 package from Sunfreeware or build TCP Wrappers with IPv6 support.

Solaris 8 SPARC Example: 

$ grep ^telnet /etc/inet/inetd.conf
telnet  stream  tcp6    nowait  root    /usr/local/bin/tcpd     in.telnetd

/var/adm/messages: 

Apr 30 12:12:41 mhapdcmap002 in.telnetd[13556]: [ID 947420 mail.warning] refused connect from 0.0.0.0
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