Matthias Apitz <guru@xxxxxxxxxxx> writes: > I launched a shell script to get some more information in this case: ok > The process with the PID in question is 'postmaster': Yeah, this should actually be a newly-forked postmaster child process, but it won't have done anything yet to change its ps-visible command line. > postmaste 14622 postgres 9u IPv4 131903453 0t0 TCP srap32dxr1.dev.oclc.org:5432->srap32dxr1.dev.oclc.org:44836 (ESTABLISHED) OK, so it's gotten a TCP not Unix-socket connection; that's already going to narrow things a little bit. > Interestingly, the other side of this connection of the port 5432 is not > visible, i.e. a 'lsof -P | grep 5432' does not show it in this moment. Permissions problem maybe? I'm not sure that lsof will tell you much about non-postgres-owned processes, unless you run it as root. regards, tom lane