I ran into this exact problem today with 1:3.4p1-1.woody.3. It's
undoubtedly a server-side MTU issue. I was able to do
ssh root@machine /sbin/ifconfig eth0 mtu 1000
and after a brief pause, everything works again.
The pause is presumably because it sent me an oversized packet before
the command actually executed, but then the MTU took effect, and the
retransmission hit the new local MTU limit and was forced to fragment.
I do not know why these MTU issues only began affecting me today,
since I have SSHed to this machine several times before. However, it
bears all the symptoms of an MTU issue, and I have experienced no
further trouble since I lowered the server's MTU.
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