I use the system setting hibernate.jdbc.use_streams_for_binary=true to stream blob/clob data from a remote oracle db to my local dev web app on my laptop.

This works great from many different locations where I do dev work, except at corporate hq. A new firewall has been put up there, and now my web app stalls when querying my user prefs blob from the db.

How can I find out which port and protocol java io is using to stream this data so I can tell the IT guys what to un-block? I can use SQL developer to access the data fine using TNS or JDBC, so I'm guessing it's a low-level java io thing. Can anyone clue me in?