[Bug 628577] Re: connection fails: ssh_exchange_identification

[Launchpad Bug Tracker]

[Expired for openssh (Ubuntu) because there has been no activity for 60
days.]

** Changed in: openssh (Ubuntu)
       Status: Incomplete => Expired

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https://bugs.launchpad.net/bugs/628577

Title:
  connection fails: ssh_exchange_identification

Status in “openssh” package in Ubuntu:
  Expired

Bug description:
  very rarely (3 times in beta testing of 100+ instances), I've seen inability to connect to an ec2 instance.  ssh client gives:
     ssh_exchange_identification: Connection closed by remote host

  In 2 of 3 cases, there were no keys written to the ssh console, but
  that is likely due to bug 606373.  All of the 3 cases were on amd64
  systems (where I've ran into race conditions more often).

  Googling for this gives lots of results, mostly related to networking
  or configuration issues, but that is not the case here, as the systems
  are identically configured to dozens of other instances that work
  correctly.

  One thing that stuck out to me was
  http://www.linuxquestions.org/questions/linux-software-2
  /ssh_exchange_identification-connection-closed-by-remote-host-103423/
  . Which seemed to be a possibility for a upstart race condition (if a
  tmp dir wasn't available yet.).

  ProblemType: Bug
  DistroRelease: Ubuntu 10.10
  Package: openssh-server 1:5.5p1-4ubuntu3
  ProcVersionSignature: User Name 2.6.35-19.28-virtual 2.6.35.3
  Uname: Linux 2.6.35-19-virtual x86_64
  Architecture: amd64
  Date: Thu Sep  2 01:59:37 2010
  Ec2AMI: ami-48b3993c
  Ec2AMIManifest: ubuntu-images-testing-eu/ubuntu-maverick-daily-amd64-server-20100831.manifest.xml
  Ec2AvailabilityZone: eu-west-1a
  Ec2InstanceType: m1.large
  Ec2Kernel: aki-4feec43b
  Ec2Ramdisk: unavailable
  ProcEnviron:
   PATH=(custom, user)
   LANG=en_GB.UTF-8
   SHELL=/bin/bash
  SourcePackage: openssh

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