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BeastOfBurden
n00b
Joined: 05 May 2004
Posts: 26
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 Posted: Tue Jun 22, 2004 5:41 pm Post subject: app crash using xorg-x11 and remote X through ssh |
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Update:
This post was actually intended to ask for help, but the first poster seems to think it was a HOWTO.  Having re-read it, I guess it could be interpreted as such unless you read to the bottom. However, I still would appreciate any help regarding my questions, so I've modified the Subject: to better reflect what issue I'd like addressed, but I also added a line about restarting sshd after updating the config file for those who are using this as a HOWTO.
I am adding a new topic because my issue is more specialized than the "experiences with xorg-x11-6.7.0" thread, and I'm afraid I might get lost in the 16+ pages that thread has grown to.
I have two Gentoo boxen at home, and they are both linked together through a wired router. One is a PII 300, the other is a P4 1.7Ghz. The P4 is our main PC and is mostly used by my wife, whereas I use the PII for tinkering.
Whenever I want to run something on the PII that requires a bit more horsepower than the PII can provide, I will run an ssh session on the faster computer so I can run my apps on the fast machine but display them on the slow machine.
I used to do this as follows (note machine names and user id changed to protect the guilty):
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xhost +p2name +p4name
ssh myusername@p4name
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Then, after typing in a password and getting a prompt on the P4:
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export DISPLAY=p2name:0.0
mozilla &
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And now I'm running Mozilla lickety split.
I later read on another thread (that I forgot to bookmark) that using xhost+ completely disables the security of ssh, and it recommended enabling X forwarding in the sshd_config of both machines...
Update: ...and restarting sshd on both PCs...
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/etc/init.d/sshd restart
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... and using the -X option of ssh to automate setting the DISPLAY...
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ssh -X myusername@p4name
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This new method works ok, though it seems that the remote app tends to refresh slower. I attribute this to the encryption/decryption, so I'm not worried about this.
I had been using the above method for about a week or so using Xfree 4.3 with no issues (or so I thought), but a few days ago I upgraded to xorg-x11 on both machines. The upgrade went very smoothly, though I noticed about a 40% decrease in frame rates on glxgears on the PII
using the xorg-x11 OpenGL implementation versus Xfree 4.3. The P4 seemed to have the same frame rates as before (it has an nvidia card).
The day after I upgraded, I was demonstrating for my wife how, if I were on the fast computer, she could still run Mozilla Mail on the faster computer using ssh -X from the slower computer (she is not a geek like me). Running Mozilla Mail worked like a charm, and I was feeling all proud of myself. I then said, "Hey, you can also run the GIMP to edit pictures!" I then started up the GIMP in the same ssh session, but as soon as I clicked on the "File" menu to load a picture, the GIMP crashed. Later on I tried to go to playhousedisney.com in Mozilla so I could play games with my son, and the site loaded up, but as soon as I clicked on one of the games, Mozilla crashed. It was rather embarassing.
My suspicion is that there is an issue with the encryption/decryption of openssh which was compiled with Xfree 4.3, or it is an issue with xorg-x11.
Stuff I have tried:
1) Downgrade to Xfree 4.3 on the PII. This had the same result.
Stuff I haven't tried yet:
1) Downgrade to XFree 4.3 on the P4 and try again.
2) Re-emerging openssh while xorg-x11 is installed.
My questions are:
1) Has anyone else seen this?
2) Should I have re-compiled openssh after upgrading to xorg-x11?
3) Does anyone have any suggestions as to how to proceed?
I will update this post with the actual error messages and my sshd_config soon.
Thanks in advance for any help.
Last edited by BeastOfBurden on Tue Jun 22, 2004 10:02 pm; edited 2 times in total |
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nightm4re
Guru
Joined: 20 Jun 2004
Posts: 519
Location: Providence, RI, USA
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| Posted: Tue Jun 22, 2004 8:55 pm Post subject: |
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I'm not sure how to answer your questions, but thanks for the guide on how to do this. I am planning on putting gentoo on my little wireless laptop and being able to do everything out on the deck, instead of being cooped up downstairs.
Your guide is certainly useful  |
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BeastOfBurden
n00b
Joined: 05 May 2004
Posts: 26
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| Posted: Fri Jun 25, 2004 3:50 am Post subject: Update - the problem is independent of X (xorg or xfree) |
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Ok, I'm back. Both machines are downgraded to xfree 4.3, and I'm still seeing Mozilla crash in a remote ssh session. I have reproduced it multiple times, both logging into the fast machine from the slow machine, and even vice versa. The crash happens after I've surfed about 5-6 pages. It doesn't seem to be web page related, because I've seen the crash happen consistently after 5-6 pages, regardless of where I've surfed.
When Mozilla is run natively (i.e. not through ssh -X), no problems.
Mozilla just returns "Exit 1", so that doesn't help much.
Here are my ssh and sshd config files. Anyone have any ideas?
/etc/ssh/ssh_config
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# $OpenBSD: ssh_config,v 1.19 2003/08/13 08:46:31 markus Exp $
# This is the ssh client system-wide configuration file. See
# ssh_config(5) for more information. This file provides defaults for
# users, and the values can be changed in per-user configuration files
# or on the command line.
# Configuration data is parsed as follows:
# 1. command line options
# 2. user-specific file
# 3. system-wide file
# Any configuration value is only changed the first time it is set.
# Thus, host-specific definitions should be at the beginning of the
# configuration file, and defaults at the end.
# Site-wide defaults for various options
# Host *
ForwardAgent yes
ForwardX11 yes
# RhostsRSAAuthentication no
# RSAAuthentication yes
# PasswordAuthentication yes
# HostbasedAuthentication no
# BatchMode no
# CheckHostIP yes
# AddressFamily any
# ConnectTimeout 0
# StrictHostKeyChecking ask
# IdentityFile ~/.ssh/identity
# IdentityFile ~/.ssh/id_rsa
# IdentityFile ~/.ssh/id_dsa
# Port 22
# Protocol 2,1
# Cipher 3des
# Ciphers aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour,aes192-cbc,aes256-cbc
# EscapeChar ~
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/etc/ssh/sshd_config
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# $OpenBSD: sshd_config,v 1.68 2003/12/29 16:39:50 millert Exp $
# This is the sshd server system-wide configuration file. See
# sshd_config(5) for more information.
# This sshd was compiled with PATH=/usr/bin:/bin:/usr/sbin:/sbin
# The strategy used for options in the default sshd_config shipped with
# OpenSSH is to specify options with their default value where
# possible, but leave them commented. Uncommented options change a
# default value.
#Port 22
Protocol 2
#ListenAddress 0.0.0.0
#ListenAddress ::
# HostKey for protocol version 1
#HostKey /etc/ssh/ssh_host_key
# HostKeys for protocol version 2
#HostKey /etc/ssh/ssh_host_rsa_key
#HostKey /etc/ssh/ssh_host_dsa_key
# Lifetime and size of ephemeral version 1 server key
#KeyRegenerationInterval 1h
#ServerKeyBits 768
# Logging
#obsoletes QuietMode and FascistLogging
#SyslogFacility AUTH
#LogLevel INFO
# Authentication:
#LoginGraceTime 2m
#PermitRootLogin yes
#StrictModes yes
#RSAAuthentication yes
#PubkeyAuthentication yes
#AuthorizedKeysFile .ssh/authorized_keys
# For this to work you will also need host keys in /etc/ssh/ssh_known_hosts
#RhostsRSAAuthentication no
# similar for protocol version 2
#HostbasedAuthentication no
# Change to yes if you don't trust ~/.ssh/known_hosts for
# RhostsRSAAuthentication and HostbasedAuthentication
#IgnoreUserKnownHosts no
# Don't read the user's ~/.rhosts and ~/.shosts files
#IgnoreRhosts yes
# To disable tunneled clear text passwords, change to no here!
#PasswordAuthentication yes
#PermitEmptyPasswords no
# Change to no to disable s/key passwords
#ChallengeResponseAuthentication yes
# Kerberos options
#KerberosAuthentication no
#KerberosOrLocalPasswd yes
#KerberosTicketCleanup yes
#KerberosGetAFSToken no
# GSSAPI options
#GSSAPIAuthentication no
#GSSAPICleanupCredentials yes
# Set this to 'yes' to enable PAM authentication (via challenge-response)
# and session processing. Depending on your PAM configuration, this may
# bypass the setting of 'PasswordAuthentication' and 'PermitEmptyPasswords'
UsePAM yes
#AllowTcpForwarding yes
#GatewayPorts no
X11Forwarding yes
#X11DisplayOffset 10
#X11UseLocalhost yes
#PrintMotd yes
#PrintLastLog yes
#TCPKeepAlive yes
#UseLogin no
#UsePrivilegeSeparation yes
#PermitUserEnvironment no
#Compression yes
#ClientAliveInterval 0
#ClientAliveCountMax 3
#UseDNS yes
#PidFile /var/run/sshd.pid
#MaxStartups 10
# no default banner path
#Banner /some/path
# override default of no subsystems
Subsystem sftp /usr/lib/misc/sftp-server
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