Inventory not being completed

For the last week or so we are trying to get the inventory to work, but unfortunately we haven't been able to do so. For the server we are using an IP address for which all TCP and UDP ports are open. Following is a log that was generated on our IDS
Built UDP connection for faddr 172.18.133.81/8001 gaddr 172.16.3.20/3835 laddr 172.16.3.20/3835

Teardown ICMP connection for faddr 172.18.133.81/512 gaddr 172.16.3.20/512 laddr 172.16.3.20/8

Built UDP connection for faddr 172.18.133.81/137 gaddr 172.16.3.20/137 laddr 172.16.3.20/137

Built ICMP connection for faddr 172.18.133.81/512 gaddr 172.16.3.20/512 laddr 172.16.3.20/8

Teardown ICMP connection for faddr 172.18.133.81/512 gaddr 172.16.3.20/512 laddr 172.16.3.20/8

As you had said, i don't see any hits on ports 445 & 335.
172.18.133.81/512 is workstation address and 20/512 is our server address.

Please help