Package version: 5.3.1-12.fc6 The patch net-snmp-5.3.1-local-addr-v2.patch which is included in the RPM breaks TCP support in snmpd, because it causes the address->security name mapping to fail for TCP requests. I suggest replacing the patch with the one I have attached. It contains the version of the "local-addres" fix from the V5-3-patches branch in the net-snmp CVS repo and includes the fix for TCP.
Created attachment 147802 [details] Suggested replacement for net-snmp-5.3.1-local-addr-v2.patch
net-snmp-5.3.1-13.fc6 has been pushed for fc6, which should resolve this issue. If these problems are still present in this version, then please make note of it in this bug report.
This bug is present in rhel5, too. I'll test the above patch on rhel5 and report back.
confirmed - this patch fixes the problem on rhel5, too.