Tunnel failures

[Yuri D'E. <wa...@th...>]

I'm just trying a combination I've never tested before: connection via
Tunnel.

Whenever I use Tunnel, synchronization fails after a few hundred
messages with:

<...>
Synchronizing...
Socket error: receive buffer full. Probably protocol error.
<...>

However, I highly doubt it's a protocol error. The tunnel is

  ssh -T server nc localhost imap

connecting to the same server and process.

In the same vein, using Tunnel does result in mbsync getting stuck doing
nothing (waiting for connection close maybe?).