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- SSH Disconnects during CVS Checkout
October 9, 2007, 3:47 pm
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repository over SSH. I've done this several times before with various
machines, but now I'm having problems. I execute:
cvs checkout <project>
And the checkout begins, but after about 50 files or so, I get the
Disconnecting: Corrupted MAC on input.
cvs [checkout aborted]: end of file from server (consult above
messages if any)
Here are the system specs:
MacPRO OS X 10.4.10
2 x 3 GHz Quad-Core Intel Xeon Processors (64 bit)
OpenSSH_4.5p1, OpenSSL 0.9.7l 28 Sep 2006
Concurrent Versions System (CVS) 1.11.20 (client/server)
OpenSSL 0.9.7l 28 Sep 2006
Red Hat Enterprise Linux AS release 3 (Taroon Update 6)
OpenSSH_3.6.1p2, SSH protocols 1.5/2.0
Concurrent Versions System (CVS) 1.11.2 (client/server)
OpenSSL 0.9.7a Feb 19 2003
I've read several posts claiming incompatible openssh/ssl versions,
but I don't think that is the problem because I have the same openssh/
ssl version combinations on a different machine, and I have had no
trouble with that.
Re: SSH Disconnects during CVS Checkout
What this means is that one end of the connection things that the data
has been corrupted in transit ie the MAC (Message Authentication Code,
think: checksum on steroids) does not validate.
Unfortunately there's many possible causes. Of the ones that have been
- routers corrupting packets
- flaky ethernet cards/drivers
- flaky RAM
Of the other possible causes which have never been proven (however there
are unresolved instances):
- bad openssl builds (possibly compiler bugs?)
- bugs in TCP stacks
- bugs in OpenSSH
See the following for documented cases:
It shouldn't be that, however if someone was having that problem and
during an upgrade replace a problem binary with a working one it could
be misinterpretted as that.
Darren Tucker (dtucker at zip.com.au)
GPG key 8FF4FA69 / D9A3 86E9 7EEE AF4B B2D4 37C9 C982 80C7 8FF4 FA69
Good judgement comes with experience. Unfortunately, the experience
usually comes from bad judgement.
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