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Full Discussion: SLES 11.2 slow SSH password prompt
Operating Systems Linux SuSE SLES 11.2 slow SSH password prompt Post 302728717 by j_aix on Thursday 8th of November 2012 09:42:52 AM
Old 11-08-2012
SLES 11.2 slow SSH password prompt
We are having an issue with slow password prompts via SSH login on all of our SLES 11.2 boxes. The output from a ssh -v login attempt shows a delay here:
Code:
debug1: SSH2_MSG_SERVICE_ACCEPT received

This issue only happens on the first logon of the day; subsequent logons are normal. Adding the client's workstation hostname/IP to /etc/hosts, and setting "UseDNS no" in /etc/ssh/sshd_config has no effect. Both the client and server can resolve respective hostnames and IP's via nslookup and dig as well.

The peculiar side is that we also have a few SLES 10.4 boxes without this issue. Between these two versions, all of the applicable config files are identical. The only server-side difference we can see thus far is the version of OpenSSH, which is minor:

SLES 11.2 = OpenSSH_5.1p1, OpenSSL 0.9.8j-fips 07 Jan 2009
SLES 10.4 = OpenSSH_5.1p1, OpenSSL 0.9.8a 11 Oct 2005

Update 11/29/12: We performed a trace during the delay and our network team found something interesting. During the first logon of the day, there is a massive ldap query performed against the AD forest, as if a cache has expired and needs refreshed. This could explain why the delay only happens once a day. We are looking into the samba/winbind configs to see if there is a setting that controls when the cache expires. Perhaps the "winbind cache time" parm could be of value to us since these servers don't have routine ldap activity.

Suggestions?
Last edited by j_aix; 11-29-2012 at 11:35 AM..
 

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LEARN ABOUT V7

sftp-server

sftp-server(1M) 					  System Administration Commands					   sftp-server(1M)

NAME

       sftp-server - SFTP server subsystem

SYNOPSIS

       /usr/lib/ssh/sftp-server

DESCRIPTION

       sftp-server implements the server side of the SSH File Transfer Protocol as defined in the IETF draft-ietf-secsh-filexfer.

       sftp-server is a subsystem for sshd(1M) and must not be run directly. There are no options or config settings.

       To enable the sftp-server subsystem for sshd add the following to /etc/ssh/sshd_config:

       Subsystem   sftp     /usr/lib/ssh/sftp-server

       See sshd_config(4) for a description of the format and contents of that file.

       There is no relationship between the protocol used by sftp-server and the FTP protocol (RFC 959) provided by in.ftpd.

EXIT STATUS

       The following exit values are returned:

       0	Successful completion.

       >0	An error occurred.

FILES

       /usr/lib/sftp-server

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWsshdu 		   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Evolving			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       sftp(1), ssh(1), ssh-add(1), ssh-keygen(1), sshd(1M), sshd_config(4), attributes(5)

       To  view  license  terms,  attribution,	and  copyright	for OpenSSH, the default path is /var/sadm/pkg/SUNWsshdr/install/copyright. If the
       Solaris operating environment has been installed anywhere other than the default, modify the given path to access the file at the installed
       location.

AUTHOR

       Markus Friedl

SunOS 5.10							    30 Jul 2003 						   sftp-server(1M)
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