I had many problems as described above (error in protocol stream code 12) after upgrading to Ubuntu 14.04, which currently distributes rsync 3.1.0.

I downloaded, configured, compiled, installed and ran the new rsync 3.1.1 (June 2014) from rsync.samba.org (see near the top of that page for links). After two tests with the same data that rsync was stumbling on, the problems appear to have dissipated, even though I'm still using compression via the rsync -z option. I made the change in both the sending and receiving systems before making the test.

I don't know why there was a problem, nor why installing the new version directly from source code worked. The release notes for rsync 3.1.1 say nothing about the problem, except possibly this, under "ENHANCEMENTS", which implies that the prior version was incompatible with a non-bundled zlib:

- Added support for a new-compression idiom that does not compress all the
      matching data in a transfer.  This can help rsync to use less cpu when a
      transfer has a lot of matching data, and also makes rsync compatible with
      a non-bundled zlib.  See the --new-compress and --old-compress options in
      the manpage.


Steve Newcomb


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