Put the output of ssh -v in E-mail, it should say what is allowed.
Steve On Sat, 5 Dec 2009, William Shu wrote:
Hi, Please for help on two [related] problems (I'm probably missing something glaring!): 1) On my newly installed SL54 on a machine *not* connected to the internet, I tried to connect to a remote machine (Redhat 9) via ssh and it does not allow me. I am lost, as sshd is activated on both machines, and I had used a laptop to make the connection to the remote machine before. I can ssh connect from the Redhat 9 machine. QUESTION: What could I be doing wrong? (script of my attempts below). I can;t pick up what to do from man pages. 2) I tried to open emacs as root, but was not allowed. I was only allowed connection after I executed $ xhost + to allow everybody access. QUESTION: Is there no more secure way of enabling users on local machine to use X without having to enumerate them, or allow all to access? In the past, I've always been able to open a terminal window as root or 3rd party and use without probs. Regards, William. [...@csc101a ~]$ uname -a Linux csc101A 2.6.18-164.2.1.el5PAE #1 SMP Tue Sep 29 19:14:47 EDT 2009 i686 i686 i386 GNU/Linux [...@csc101a ~]$ [...@csc101a ~]$ ssh -XY 192.168.10.1 ssh: connect to host 192.168.10.1 port 22: Connection refused [...@csc101a ~]$ xhost access control enabled, only authorized clients can connect SI:localuser:wss [...@csc101a ~]$ xhost + access control disabled, clients can connect from any host [...@csc101a ~]$ ssh -XY w...@192.168.10.1 ssh: connect to host 192.168.10.1 port 22: Connection refused [...@csc101a ~]$ ssh -XY w...@192.168.10.1 ssh: connect to host 192.168.10.1 port 22: Connection refused [...@csc101a ~]$ ssh -XY w...@192.168.10.1 ssh: connect to host 192.168.10.1 port 22: Connection refused [...@csc101a ~]$ man xhost [...@csc101a ~]$ ssh -v -XY 192.168.10.1 OpenSSH_4.3p2, OpenSSL 0.9.8e-fips-rhel5 01 Jul 2008 debug1: Reading configuration data /etc/ssh/ssh_config debug1: Applying options for * debug1: Connecting to 192.168.10.1 [192.168.10.1] port 22. debug1: connect to address 192.168.10.1 port 22: Connection refused ssh: connect to host 192.168.10.1 port 22: Connection refused [...@csc101a ~]$ ssh -vv -XY 192.168.10.1 OpenSSH_4.3p2, OpenSSL 0.9.8e-fips-rhel5 01 Jul 2008 debug1: Reading configuration data /etc/ssh/ssh_config debug1: Applying options for * debug2: ssh_connect: needpriv 0 debug1: Connecting to 192.168.10.1 [192.168.10.1] port 22. debug1: connect to address 192.168.10.1 port 22: Connection refused ssh: connect to host 192.168.10.1 port 22: Connection refused [...@csc101a ~]$ ssh -vvv -XY 192.168.10.1 OpenSSH_4.3p2, OpenSSL 0.9.8e-fips-rhel5 01 Jul 2008 debug1: Reading configuration data /etc/ssh/ssh_config debug1: Applying options for * debug2: ssh_connect: needpriv 0 debug1: Connecting to 192.168.10.1 [192.168.10.1] port 22. debug1: connect to address 192.168.10.1 port 22: Connection refused ssh: connect to host 192.168.10.1 port 22: Connection refused [...@csc101a ~]$ ---------- [r...@csc101a wss]# emacs & [1] 4833 [r...@csc101a wss]# Xlib: connection to ":0.0" refused by server Xlib: No protocol specified emacs: Cannot connect to X server :0.0. Check the DISPLAY environment variable or use `-d'. Also use the `xhost' program to verify that it is set to permit connections from your machine.
-- ------------------------------------------------------------------ Steven C. Timm, Ph.D (630) 840-8525 t...@fnal.gov http://home.fnal.gov/~timm/ Fermilab Computing Division, Scientific Computing Facilities, Grid Facilities Department, FermiGrid Services Group, Assistant Group Leader.
