rekeying request causes loss of connection

Matt Johnston matt at
Thu Nov 9 21:55:11 WST 2006

On Thu, Nov 09, 2006 at 12:53:30PM +0000, Simon Rowe wrote:
> A colleague is reporting a problem with dropbear 0.48, he's loosing the 
> connection after about 8 hours and sees the following error
> Hm, dispatch protocol error: type 20, plen 176
> dispatch_protocol_error: rekeying is not supported
> The client is very elderly, OpenSSH 2.5.2p2, is there some incompatibility 
> with it?

Yeah, looks like OpenSSH before 3.0 [1] didn't implement
rekeying (which is a required part of the SSH spec). A
workaround is to set Dropbear's KEX_REKEY_TIMEOUT in
options.h to a really big (though < 2,000,000,000) number.


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