transfer interrupted (code 20) at rsync.c(229)

[Gerald Waugh]

rsync had been working fine for months.
Now, I get this error in my rsyncd log.
2001/08/15 07:18:59 [433] transfer interrupted (code 20) at rsync.c(229)
++++++ rsyncd.conf ++++++++
motd file = /etc/rsync.motd
log file  = /var/log/rsyncd.log
pid file  = /var/run/rsyncd.pid
lock file = /var/run/rsync.lock
max connections = 5
[all]
      comment = sync all
      path = /
      read only = yes
      list = yes
      uid = root
      gid = root
      hosts allow = 216.175.178.32/255.255.255.240
[home]
      comment = home directory
      path = /home
      read only = yes
      list = yes
      uid = root
      gid = root
      hosts allow = 216.175.178.32/255.255.255.240
[etc]
      comment = etc directory
      path = /etc
      read only = yes
      list = yes
      uid = root
      gid = root
      hosts allow = 216.175.178.32/255.255.255.240

Can someone give me a clue?
TIA
Gerald Waugh