error msg: No support for requested transport domain "tcp"

hi, all
        I met a problem in the recent use of net-snmp, the version is
5.2.0.

        Sometimes, I can not send trap after my subagent is working, I
found something in the trace.

        No support for requested transport domain "tcp"
        Error: Failed to connect to the agentx master agent: Unknown
host (Inappropriate ioctl for device)

        I configure agentx with unix domain socket
        I check the source code, but I still have no idea why this
happened.
        In my opinion, after snmpd started, subagent call init_agent,
then init_snmp, traps can be sent sucessfully. 
        If you met this problem before or you have idea what happened
behind this, please help me. Thanks in advance.

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