[Bug 1887] New: Failure to initiate 12+ simulateous connections using priv-key auth

[bugzilla-daemon at bugzilla.mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=1887

           Summary: Failure to initiate 12+ simulateous connections using
                    priv-key auth
           Product: Portable OpenSSH
           Version: 5.5p1
          Platform: All
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: ssh
        AssignedTo: unassigned-bugs at mindrot.org
        ReportedBy: ddick at iinet.net.au


Created attachment 2026
  --> https://bugzilla.mindrot.org/attachment.cgi?id=2026
Bourne Shell Script to reproduce issue

When rapidly starting a lot of ssh connections to remote hosts, the
most that can be done is about 12 without running into odd error
messages.  When running in verbose mode the log shows;

OpenSSH_5.5p1, OpenSSL 1.0.0d-fips 8 Feb 2011
debug1: Reading configuration data /home/dave/.ssh/config^M
debug1: Reading configuration data /etc/ssh/ssh_config^M
debug1: Applying options for *^M
debug2: ssh_connect: needpriv 0^M
debug1: Connecting to localhost [127.0.0.1] port 22.^M
debug1: Connection established.^M
debug2: key_type_from_name: unknown key type '-----BEGIN'^M
debug2: key_type_from_name: unknown key type 'Proc-Type:'^M
debug2: key_type_from_name: unknown key type 'DEK-Info:'^M
debug2: key_type_from_name: unknown key type '-----END'^M
debug1: identity file /home/dave/.ssh/id_rsa type 1^M
debug1: identity file /home/dave/.ssh/id_rsa-cert type -1^M
debug1: identity file /home/dave/.ssh/id_dsa type -1^M
debug1: identity file /home/dave/.ssh/id_dsa-cert type -1^M
ssh_exchange_identification: Connection closed by remote host

so the tcp connection seemingly gets made and then killed shortly
afterwards.  Both the client log and the server log indicate that the
other side closed the connection.  There is an example script attached
to replicate the issue, it expects that a private key will be available
via an agent.

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