Many events: ... sent unsupported channel request (10, env).

Alex · October 2018

Hi.

Machine Type: NetApp

System ID: 1574799284

System Model: N6240

System Mode: 7MODE

ONTAP Version: Data ONTAP Release 8.1.4P10 7-Mode: Fri Nov 11 22:59:59 PST 2016

See in Health status many strings:

Column Event

SSH client (SSH-2.0-OpenSSH_7.4) from 10.100.0.235 sent unsupported channel request (10, env).

What need make, for exclude this messages?

Alex · October 2018

In some Internet posts i read that problem with env LANG
ssh -vvv ...

debug1: Sending environment.

debug3: Ignored env XDG_SESSION_ID

debug3: Ignored env HOSTNAME

debug3: Ignored env TERM

debug3: Ignored env SHELL

debug3: Ignored env HISTSIZE

debug3: Ignored env USER

debug3: Ignored env LS_COLORS

debug3: Ignored env MC_TMPDIR

debug3: Ignored env PATH

debug3: Ignored env MAIL

debug3: Ignored env PWD

debug1: Sending env LANG = en_US.UTF-8

debug2: channel 0: request env confirm 0

debug3: send packet: type 98

debug3: Ignored env HISTCONTROL

debug3: Ignored env HOME

debug3: Ignored env SHLVL

debug3: Ignored env MC_SID

debug3: Ignored env LOGNAME

debug3: Ignored env LESSOPEN

debug3: Ignored env OLDPWD

debug3: Ignored env _

Option -o SendEnv=no not work for my SSH client.

Alex · October 2018

I find two methods:

1. disable LANG in /etc/ssh/ssh_config, but it effect on ALL ssh sessions
#SendEnv LANG

2. make /home/stor2rrd/stor2rrd/ssh_config with:

Ciphers +3des-cbc

Host *
by view original /etc/ssh/ssh_config by command: cat /etc/ssh/ssh_config | grep -v "^#"

and edit bin/napref.pl in line 43 to:
$ssh = "ssh -F /home/stor2rrd/stor2rrd/ssh_config -o ConnectTimeout=15 -o StrictHostKeyChecking=no -o PreferredAuthentications=publickey ";

Events in Health Status in NetApp is no.

I do not know, may be found more methods for resolve this ptoblems?

Pavel · October 2018

Hi,

Set SSH parameter in etc/stor2rrd.cfg to:

SSH="ssh -q -o ConnectTimeout=80 -o StrictHostKeyChecking=no -o PreferredAuthentications=publickey -o SendEnv=no "

This should be setting. It contains -o SendEnv=no

Does it help?

Alex · October 2018

Hi, Pavel, you directly write option SendEnv=no in naperf.pl line 43. But it not work for me.

OS:

[root@stor2rrd ~]# uname -a

Linux stor2rrd 3.10.0-693.21.1.el7.x86_64 #1 SMP Wed Mar 7 19:03:37 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

[root@stor2rrd etc]# cat /etc/centos-release

CentOS Linux release 7.4.1708 (Core)

V1:

[stor2rrd@stor2rrd stor2rrd]$ ssh -o ConnectTimeout=15 -o StrictHostKeyChecking=no -o PreferredAuthentications=publickey -o SendEnv=no -vvv stor2rrd@10.100.0.246

debug1: Sending environment.

debug3: Ignored env XDG_SESSION_ID

debug3: Ignored env HOSTNAME

debug3: Ignored env TERM

debug3: Ignored env SHELL

debug3: Ignored env HISTSIZE

debug3: Ignored env USER

debug3: Ignored env LS_COLORS

debug3: Ignored env MC_TMPDIR

debug3: Ignored env PATH

debug3: Ignored env MAIL

debug3: Ignored env PWD

debug1: Sending env LANG = en_US.UTF-8

debug2: channel 0: request env confirm 0

debug3: send packet: type 98

debug3: Ignored env HISTCONTROL

debug3: Ignored env HOME

debug3: Ignored env SHLVL

debug3: Ignored env MC_SID

debug3: Ignored env LOGNAME

debug3: Ignored env LESSOPEN

debug3: Ignored env OLDPWD

debug3: Ignored env _

V2:

[stor2rrd@stor2rrd stor2rrd]$ ssh -F ssh_config -o ConnectTimeout=15 -o StrictHostKeyChecking=no -o PreferredAuthentications=publickey -vvv stor2rrd@10.100.0.246

# no Sending environment section #

Finaly, clear command ssh
V3:

[stor2rrd@stor2rrd stor2rrd]$ ssh -o ConnectTimeout=15 -o StrictHostKeyChecking=no -o PreferredAuthentications=publickey -vvv stor2rrd@10.100.0.246

debug1: Sending environment.

debug3: Ignored env XDG_SESSION_ID

debug3: Ignored env HOSTNAME

debug3: Ignored env TERM

debug3: Ignored env SHELL

debug3: Ignored env HISTSIZE

debug3: Ignored env USER

debug3: Ignored env LS_COLORS

debug3: Ignored env MC_TMPDIR

debug3: Ignored env PATH

debug3: Ignored env MAIL

debug3: Ignored env PWD

debug1: Sending env LANG = en_US.UTF-8

debug2: channel 0: request env confirm 0

debug3: send packet: type 98

debug3: Ignored env HISTCONTROL

debug3: Ignored env HOME

debug3: Ignored env SHLVL

debug3: Ignored env MC_SID

debug3: Ignored env LOGNAME

debug3: Ignored env LESSOPEN

debug3: Ignored env OLDPWD

debug3: Ignored env _

Alex · October 2018

Thanks for your comment. I see what is var $ENV{SSH}.
My changes in naperf.pl to:

my $ssh = $ENV{SSH};

#if ( !defined($ssh) || $ssh eq '' ) {

# $ssh = "ssh -o ConnectTimeout=15 -o StrictHostKeyChecking=no -o PreferredAuthentications=publickey -o SendEnv=no ";

$ssh = "ssh -F /home/stor2rrd/stor2rrd/ssh_config -o ConnectTimeout=15 -o StrictHostKeyChecking=no -o PreferredAuthentications=publickey ";

#}

Pavel · October 2018

ok, this should help:

vi ~/.ssh/config

SendEnv no

try it now.

if stil no way then try to comment out all SendEnv in /etc/ssh/ssh_config

Alex · October 2018

Make it, not work.

[stor2rrd@stor2rrd stor2rrd]$ ll ~/.ssh/config

-rw-r--r-- 1 stor2rrd stor2rrd 13 Oct 18 12:54 /home/stor2rrd/.ssh/config

[stor2rrd@stor2rrd stor2rrd]$ cat ~/.ssh/config

SendEnv no

[stor2rrd@stor2rrd stor2rrd]$

[stor2rrd@stor2rrd stor2rrd]$ ssh -o ConnectTimeout=15 -o StrictHostKeyChecking=no -o PreferredAuthentications=publickey -vvv stor2rrd@10.100.0.246

debug1: Sending environment.

debug3: Ignored env XDG_SESSION_ID

debug3: Ignored env HOSTNAME

debug3: Ignored env TERM

debug3: Ignored env SHELL

debug3: Ignored env HISTSIZE

debug3: Ignored env USER

debug3: Ignored env LS_COLORS

debug3: Ignored env MC_TMPDIR

debug3: Ignored env PATH

debug3: Ignored env MAIL

debug3: Ignored env PWD

debug1: Sending env LANG = en_US.UTF-8

debug2: channel 0: request env confirm 0

debug3: send packet: type 98

debug3: Ignored env HISTCONTROL

debug3: Ignored env HOME

debug3: Ignored env SHLVL

debug3: Ignored env MC_SID

debug3: Ignored env LOGNAME

debug3: Ignored env LESSOPEN

debug3: Ignored env OLDPWD

debug3: Ignored env _

..

n6240-1a> Thu Oct 18 12:55:47 MSK [n6240-1a:openssh.invalid.channel.req:warning]: SSH client (SSH-2.0-OpenSSH_7.4) from 10.100.0.235 sent unsupported channel request (10, env).

exit

[stor2rrd@stor2rrd stor2rrd]$ ssh -o ConnectTimeout=15 -o StrictHostKeyChecking=no -o PreferredAuthentications=publickey -o SendEnv=no -vvv stor2rrd@10.100.0.246

debug1: Sending environment.

debug3: Ignored env XDG_SESSION_ID

debug3: Ignored env HOSTNAME

debug3: Ignored env TERM

debug3: Ignored env SHELL

debug3: Ignored env HISTSIZE

debug3: Ignored env USER

debug3: Ignored env LS_COLORS

debug3: Ignored env MC_TMPDIR

debug3: Ignored env PATH

debug3: Ignored env MAIL

debug3: Ignored env PWD

debug1: Sending env LANG = en_US.UTF-8

debug2: channel 0: request env confirm 0

debug3: send packet: type 98

debug3: Ignored env HISTCONTROL

debug3: Ignored env HOME

debug3: Ignored env SHLVL

debug3: Ignored env MC_SID

debug3: Ignored env LOGNAME

debug3: Ignored env LESSOPEN

debug3: Ignored env OLDPWD

debug3: Ignored env _

Alex · October 2018

I read many posts in Internet. Try many variations, but ALL not work. I do not know why.
But i modify my variant line 43 in /bin/naperf.pl, for not need make any additional files, it is work:

$ssh = "ssh -F /dev/null -o Ciphers=+3des-cbc -o ConnectTimeout=15 -o StrictHostKeyChecking=no -o PreferredAuthentications=publickey ";

Pavel · October 2018

does above setting work?

Have you trie dto comment this?

grep SendEnv /etc/ssh/ssh_config

Alex · October 2018

Hi Pavel.
My variant is work on all NetApp 7-mode (4 controllers).

My edtition of file at top in bin/naperf.pl

my $ssh = $ENV{SSH};

#if ( !defined($ssh) || $ssh eq '' ) {

# $ssh = "ssh -o ConnectTimeout=15 -o StrictHostKeyChecking=no -o PreferredAuthentications=publickey -o SendEnv=no ";

# $ssh = "ssh -F /home/stor2rrd/stor2rrd/ssh_config -o ConnectTimeout=15 -o StrictHostKeyChecking=no -o PreferredAuthentications=publickey ";

$ssh = "ssh -F /dev/null -o Ciphers=+3des-cbc -o ConnectTimeout=15 -o StrictHostKeyChecking=no -o PreferredAuthentications=publickey ";

#}

Comment i do not trie, because server serve more storages and SAN switches, and my inventory scripts. This is problem of NetApp, and i effect only by this storage.

[root@stor2rrd ~]# cat /etc/ssh/ssh_config | grep -v "^#"

Ciphers +3des-cbc

Host *

GSSAPIAuthentication yes

ForwardX11Trusted yes

SendEnv LANG LC_CTYPE LC_NUMERIC LC_TIME LC_COLLATE LC_MONETARY LC_MESSAGES

SendEnv LC_PAPER LC_NAME LC_ADDRESS LC_TELEPHONE LC_MEASUREMENT

SendEnv LC_IDENTIFICATION LC_ALL LANGUAGE

SendEnv XMODIFIERS

[root@stor2rrd ~]#

~/.ssh/config
~/.ssh/environment
and /home/stor2rrd/stor2rrd/ssh_config
not exists.

Alex · October 2018

Pavel, i use article to do this:
https://superuser.com/questions/485569/how-to-disable-sendenv-variables-set-in-ssh-config-from-ssh-config/485627
and
https://stackoverflow.com/questions/29609371/how-do-not-pass-locale-through-ssh

Pavel · October 2018

ok, then this did the trick?

ssh -F /dev/null

You can use SSH variable in etc/stor2rrd.cfg to persist product upgrade.

Pls confirm it.

Alex · October 2018

Yes,
ssh -F /dev/null
make call ssh with default settings, but for NetApp need:
Ciphers +3des-cbc
and i add in cmd option:
-o Ciphers=+3des-cbc

SSH variable in etc/stor2rrd.cfg is used in many Perl files, i need sink about it, and time to test.

Alex · October 2018

OK, i make as you wish. Work normaly more 30 minutes. I tested on NetApp n6240 7-mode, IBM Storwize 3700/5000/5030, Fujitsu ETERNUS DX200.
I return code to default.

As Pavel ask, make changes in one file:
etc/stor2rrd.cfg

# SSH client

#SSH="ssh -q -o ConnectTimeout=80 -o StrictHostKeyChecking=no -o PreferredAuthentications=publickey -o SendEnv=no "

# use this in case of Reflection/Tectia or other comercial ssh distros "ssh -q "

SSH="ssh -q -F /dev/null -o Ciphers=+3des-cbc -o ConnectTimeout=80 -o StrictHostKeyChecking=no -o PreferredAuthentications=publickey "

Many events: ... sent unsupported channel request (10, env).

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