Here's my sup process:
root     16320  0.0 19.1  3636 3120 p2  S     8:10PM    0:08.27 /usr/local/bin/

It gets up to this size & then idles, no longer getting any data; a
second after I did this ps listing it went I(dle).

Netstat -n gives:
Proto Recv-Q Send-Q  Local Address          Foreign Address        (state)
tcp        0  16124  xxx.yyy.zzz.zzz.1043   206.86.8.12.871        ESTABLISHED

Has there been a change to sup recently?  Why is it hanging?  I've been
trying all day.  I let it go first time around for about 2 hours and
it finally bombed with some message but I forget what it was... maybe some
kind of network timeout.

Last full sup was 9 Feb 1996.