You are viewing a plain text version of this content. The canonical link for it is here.
Posted to dev@mina.apache.org by "Guillaume Nodet (JIRA)" <ji...@apache.org> on 2013/11/28 23:20:35 UTC
[jira] [Commented] (SSHD-255) sshd does not (always?) reply to
requests setting 'want reply'
[ https://issues.apache.org/jira/browse/SSHD-255?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13835092#comment-13835092 ]
Guillaume Nodet commented on SSHD-255:
--------------------------------------
THere are 2 cases: unknown requests always result in a SSH_MSG_CHANNEL_FAILURE being sent back by sshd. However requests ending with @putty.projects.tartarus.org will be discarded without any response message.
Is the request you're talking about falling in that use case ?
> sshd does not (always?) reply to requests setting 'want reply'
> --------------------------------------------------------------
>
> Key: SSHD-255
> URL: https://issues.apache.org/jira/browse/SSHD-255
> Project: MINA SSHD
> Issue Type: Bug
> Affects Versions: 0.5.0, 0.6.0
> Environment: Seen w/ Gerrit (http://gerrit.googlecode.com) running via Tomcat 7 & Oracle JDK 7 on CentOS 6.x x86_64. Client was TortoiseGit using PuTTY 0.63 for SSH transport. Gerrit 2.5.x uses sshd 0.5.1, Gerrit 2.7.x uses sshd 0.6.0.
> Reporter: Will Saxon
>
> Upon upgrading to PuTTY 0.63, a developer was unable to fetch changes from Gerrit projects if there were lots of outstanding changes (>200). The fetch would hang.
> After consulting w/ the TortoiseGIT and PuTTY developers, it was determined that the hangs occurred as PuTTY was sending several SSH_MSG_CHANNEL_REQUEST 'winadj' messages with the 'want reply' flag set. sshd is not replying to these requests and PuTTY is blocking on the reply, leading to a perceived 'hang' by the user.
> I don't have a copy of the entire email exchange, but it reads like the SSH standard indicates replies should only be sent when 'want reply' is true, but sshd always sends replies for requests it understands and never sends replies for requests it does not, regardless of the value of 'want reply'.
--
This message was sent by Atlassian JIRA
(v6.1#6144)