dbms_pipe: what would cause a timeout?

Good day, list,

What would cause a call to dbms_pipe.send_message to timeout?

We have an ERP-delivered procedure that "pings" a few public ERP pipes in
Oracle 10.2.0.3 running on Solaris 8. I tried tracing (event 10046) but did
not find much, and trying to drill down via OEM was difficult at best. Could
be me. =) I am trying to understand what would cause a timeout, whether it
be a database problem, and if so, where. Not much documentation about
pipe-specific problems out there in the wild.

-- 
Charles Schultz

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