remote pg_dump hangs always at same table

Hi all,

I have a daily remote backup session like
   pg_dump -h db -i -Fp database | gzip > file
which hangs after producing about 200 MB of compressed output:
----------
     TIME CMD
  0:00.05 /usr/local/pgsql/bin/pg_dumpall -h db -i
  0:21.45 /usr/local/pgsql/bin/pg_dump -h db -i -Fp database
----------
It happens always during copy of this table:
------------
                    Table "archiveopteryx.bodyparts"
  Column |  Type   |                     Modifiers
--------+---------+----------------------------------------------------
  id     | integer | not null default nextval('bodypart_ids'::regclass)
  bytes  | integer | not null
  hash   | text    | not null
  text   | text    |
  data   | bytea   |
Indexes:
     "bodyparts_pkey" PRIMARY KEY, btree (id)
     "b_h" btree (hash)
Referenced by:
     TABLE "unparsed_messages" CONSTRAINT
"unparsed_messages_bodypart_fkey" FOREIGN KEY (bodypart) REFERENCES
bodyparts(id) ON DELETE CASCADE
-----------
Interesting: I have a test and a production database with the same
schema but different data and it happens with both databases at
exactly this table.

There is no problem to dump the databases locally on the server and
fetch the dump from the client via scp.

Versions: Server: 8.3.6 on FreeBSD 7.0; Client: 8.3.7 on darwin 9.8.0.
Network: 2 adjacent LANs via firewall (OpenBSD 4.6/pf). State table
looks ok; extract:
---------
em0 tcp xxx.yyy.zzz.10:5432 <-     .10:63169       ESTABLISHED:ESTABLISHED
    [615902410 + 524280] wscale 3  [396592834 + 66176] wscale 3
    age 10:47:05, expires in 23:15:07, 199433:386306 pkts,
10820556:561637949 bytes, rule 77
    id: 4b8ecbd8001ddfbd creatorid: cd2329ff
dc0 tcp uuu.vvv.www.10:63169 -> xxx.yyy.zzz.10:5432
ESTABLISHED:ESTABLISHED
    [396592834 + 66176] wscale 3  [615902410 + 524280] wscale 3
    age 10:47:05, expires in 23:15:07, 199433:386306 pkts,
10820556:561637949 bytes, rule 172
    id: 4b8ecbd8001ddfbe creatorid: cd2329ff
---------
Netstat on client: tcp4 0 0 z.63169 db.postg ESTABLISHED
Netstat on Server: tcp4 0 0 db.postgresql z.63169 ESTABLISHED

Any help appreciated,
Axel
---
axel.rau@chaos1.de  PGP-Key:29E99DD6  +49 151 2300 9283  computing @
chaos claudius