Agentx communication issues with net-snmp 5.4.1

Hi,

I was using net-snmp 5.1.4 earlier and we have a subagent communicating
using agentx with our master agent. Things were working fine.

We are now trying to upgrade to net-snmp 5.4.1 and the master agent and
the subagent are not communicating. The subagent seems to register the
MIBS fine, I can see this when I turn on logging using -Dagentx. After
that the snmpget requests are timing out. I see that the master agent is
sending these requests but not getting any response and is eventually
timing out and closing the connection. On the subagent's  end, the
'agent_check_and_process(1)' call does not come out indicating that it
did not receive any packets ? 

1. I am building net-snmp 5.4.1 with openssl10.9.7m and ipv6 enabled.
2. Running SNMPv3 and snmpd.conf has 
master agentx 
agentXTimeout 10 
agentXRetries 6 
agentXSocket tcp:127.0.0.1:705 (we are using tcp sockets and not unix
stream sockets).
3. snmpd is run as follows $MY_SNMP_PATH/snmpd -x tcp:127.0.0.1:705
udp:8500 -c /MY_SNMP_PATH/snmpd.conf ie. master is listening on 8500 and
to subagent (agentX) on 705
4.Subagent code does - 
netsnmp_ds_set_boolean(NETSNMP_DS_APPLICATION_ID,NETSNMP_DS_AGENT_ROLE,
1); - 
netsnmp_ds_set_string(NETSNMP_DS_APPLICATION_ID,NETSNMP_DS_AGENT_X_SOCKE
T,"tcp:127.0.0.1:705"); prior to init_agent and init_snmp
Is it really necessary to have a configuration file with the name given
in init_agent() ? We have not had that so far and things worked fine ?
An snmpwalk on .1.3.6.1.2.1 snmpd responds no problems. 
Snmpwalk for my subagent OID results in packets piling on the 705
connection and it eventually closes with log trace - Timeout: No
Response from localhost:8500 
netstat traces 
udp 0 0 0.0.0.0:8500 0.0.0.0:*
 ...
 tcp 0 0 127.0.0.1:705 0.0.0.0:* LISTEN 
tcp 0 0 127.0.0.1:705 127.0.0.1:41817 ESTABLISHED 
tcp 3168 0 127.0.0.1:41817 127.0.0.1:705 ESTABLISHED 
...
 tcp 0 0 127.0.0.1:705 0.0.0.0:* LISTEN 
tcp 4513 0 127.0.0.1:41817 127.0.0.1:705 CLOSE_WAIT 
tcp 0 0 127.0.0.1:705 127.0.0.1:41817 FIN_WAIT2 
This has been working fine with NetSNMP-5.1.4 . Appreciate any inputs as
to what I'm missing !!!  Is there anything new in 5.4.1 not present in
5.1.4 ?
Thanks in advance.
-Latha.






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