[Bug 3170] New: Sometimes sshd responds with different server signature

[bugzilla-daemon at mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=3170

            Bug ID: 3170
           Summary: Sometimes sshd responds with different server
                    signature
           Product: Portable OpenSSH
           Version: 8.1p1
          Hardware: ARM
                OS: Other
            Status: NEW
          Severity: normal
          Priority: P5
         Component: sshd
          Assignee: unassigned-bugs at mindrot.org
          Reporter: steven at c88.org

Created attachment 3397
  --> https://bugzilla.mindrot.org/attachment.cgi?id=3397&action=edit
sshd and ssh logs during good and bad transactions

I am running openssh-server 8.1p-1 on a Netgear R7800 router (running
DD-WRT).

I am having a problem with basic SSH operation with openssh. I have a
separate dropbear SSH server running on a different port (which has
been rock solid) and configured openssh to use another for testing
purposes.

I find that about 80% of the time, I can do an ssh operation from my
Cygwin laptop to the openssh server with no problem. But the other
times I get an error "incorrect signature" which tells me the server
sometimes returns a different signature than my client expected.

I was able to capture debug logging on both the SSH client and the SSH
server when I executed "ssh router ls -a" for both good and bad (failed
with incorrect signature) transactions.

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