I spent some time a couple of weeks ago working on an intermittent problem we''ve been seeing for at least 8 months now. It''s a complex problem so I''m just trying to determine what I can see with regards to network connection states. Basically, we an image processing server (IP) than sends a request via a web cache server (WC) to an OAS HTTP server (WS), which in turn sends its response back to the IP via the WC. On very rare occasions, the IP doesn''t get a response from the WS leading to a job getting into a funky state and the IP ending up with its connections in a FIN_WAIT_2 state since they''re not receiving the ACKs. What we don''t know is whether the WS is sending them and, if so, whether they''re getting lost somewhere between the WS HTTP server processes and the IP. So, I was trying to use DTrace to get down into the kernel to see if I could even see something as simple as TCP packets being sent from the WS and noting what kind of packets they are, e.g. ACK, FIN/ACK, etc. But I''m stumped as to how to do that, especially without a DTrace network provider. I was trying tcpsnoop in the 0.99 DTrace toolkit, but I get the following: Any thoughts to get me pointed in the right direction? Thanks, Justin -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://mail.opensolaris.org/pipermail/dtrace-discuss/attachments/20071025/fe4f6d73/attachment.html>