[9fans] fs error msg: didn't like (1460 274) byte message

[Axel Belinfante <Axel.Belinfante@cs.utwente.nl>]

Just had a problem copying/saving a file from acme at home
(over a right now not excitingly fast connection)
to the fake worm server at work.
When it happened, acme hang (until I fysically disrupted the connection
-- could not think of something else) and cp also hang.
(after disrupting the connection, acme returned to a usable state,
so I could save the file to local disk -- many thanks to the person
bringing up this kind of things (hanging fs connection) some days ago!)
When it happened, I had a 'C fs' window open, in which appeared:

didn't like 1460 byte message
didn't like 274 byte message

Scenario:
working at home on a laptop that has had the 60Mb update;
the kernel is a few days older, of september 18.
Because I have this funny router at the home  end of the cable
modem connection, and it does not let il through, I have

cpu%  cat /rc/bin/service/tcp564
#!/bin/rc
exec aux/trampoline il!super!9fs
cpu%

on the cpu server and run '9fs cpu' to connect to the file server.
(the cpu server is diskless and gets root from fs; also its
kernel is from september 18, I think).

The problem seems reproducible: when saving the remote file
from acme failed, I saved it locally and tried then copying it to fs,
with the same result. However, doing a 'cat > target'
in the cpu window, and pasting the text from the (short) file there,
followed by ^D was succesful (remember, cpu server gets root from fs).

The fs kernel is a bit old, from May 28. Can that explain this?

Is there anything easy I could try to get more insight?
I tried 'flag chat' on the fs, but that did not seem
to give info on the 'not-liked' packages -- but maybe I overlooked.

I'll keep the latop running and connected, in case there are some
things I could try.

Just tried to open a new window, run 9fs cpu, and tried again to
copy the same file from local disk to remote fs. Same result.

Axel (concerned, but still hoping for a simple explanation...)