-
Before you continue,
you must first
make sure that
your Mac has a
correct hostname.
Run this command in a command window:
hostnameMake sure the hostname does not contain spaces or Chinese characters
- If your hostname contains
space(s)
or Chinese characters, do the following
to fix it first:
Under Settings --> Sharing change the computer name (use a name with ONLY English letters and no spaces !)
- Remote login to
a workstation in
the MathCS lab:
- Open an command window on your Mac
- Use the following command in the
command window to
login to the
lab0z gateway
of the department:
ssh -l yourNetID lab0z.mathcs.emory.edu Note: 0. Cut and paste the command to your MAC !!! 1. Replace yourNetID with your Emory Net ID 2. -l is a lower case ell (not the number 1) !!!!
- Log in with your password.
- Note: you will not see anything that you typed (because the password is secret); however, letters are being entered until you hit the [Enter] key.
Important note:
- Do not compile and run your programs on lab0z.mathcs.emory.edu !!!
- Open an command window on your Mac
- Very important:
- After log in to
lab0z.mathcs.emory.edu,
check for
unused machines in the
MathCS lab with the command:
cat /tmp/labmachinesExample:
- Select an
unused machine from the
list and use
ssh to
login to the
lab machine:
ssh labUV
where:
U is a number: 1,2,3,4,5,6,7 V is a letter: a,b,c,d,e,f,g
is an idle labmachine from the cat /tmp/labmachines output.
- Example:
ssh lab3d
(You may need to re-enter your Emory NetID password)
Then:
- Use the cd command to change the working directory to your project directory
Now you are ready to issue UNIX commands from your Mac PC !!!
Commands that you type in the ssh window will be executed on the lab-machine at Emory
You must first upload your assignment to a lab-machine before you can issue the turn-in command.
Follow the instructions from the homework assignments to turn in your assignment.
- After log in to
lab0z.mathcs.emory.edu,
check for
unused machines in the
MathCS lab with the command:
- ssh_exchange_identification error
- When you executes the
ssh command,
it exits right away
with this
error message:
Symtome:
OnYourMac>> ssh -l NetID lab0z.mathcs.emory.edu ssh_exchange_identification: read: Connection reset by peer
- How to fix it:
you need to
install
Emory VPN !!!
See this link on how to install Emory VPN: click here
- When you executes the
ssh command,
it exits right away
with this
error message:
- Cannot make
a connection to
lab0z.mathcs.emory.edu:
- When you executes the
ssh command,
it exits right away:
Symtome:
OnYourMac>> ssh -l NetID lab0z.mathcs.emory.edu ssh_exchange_identification: read: Connection reset by peer
After running the ssh command, it exits with an error message
Solution procedure:
- Double click Macintosh HD
on your Desktop
- On the left side of the box, under
Places,
click on your user name.
This will take you to your home folder.
- At your home folder, hit this key combination:
-
<command> + <shift> + <g>
(All keys at once)
- A "Go to the folder:" box
will pop up.
Type .ssh in the box then hit <return>.
This will take you inside th .ssh directory.
- Delete the
known_hosts file.
Now you can use ssh again.
Further note:
- If the above procedure does not work,
then the
MathCS firewall restrictions
is blocking your access to
lab0z.mathcs.emory.edu.
You must install Emory's VPN software:
1. Call LITS Helpdesk at 404-727-7777 and request access to the VPN for your NetID. 2. Following instructions at this webpage to install VPN software: http://it.emory.edu/security/vpn.html
- When you executes the
ssh command,
it exits right away:
-
Fixing "REMOTE HOST IDENTIFICATION HAS CHANGED" error
- Sometime, the MathCS department
changes system information on the workstations
(e.g.: upgrading to a new system).
This will cause the following error when you use ssh to connect to the machine:
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ @ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY! Someone could be eavesdropping on you right now (man-in-the-middle attack)! It is also possible that the RSA host key has just been changed. The fingerprint for the RSA key sent by the remote host is ??:??:.... (a lot of numbers and letters separated by ":") Please contact your system administrator.
There is no attack, but you do need to fix something on your Mac before you can use ssh again...
- How to fix it:
- Double click Macintosh HD
on your Desktop
- On the left side of the box, under
Places,
click on your user name.
This will take you to your home folder.
- At your home folder, hit this key combination:
-
<command> + <shift> + <g>
(All keys at once)
- A "Go to the folder:" box
will pop up.
Type .ssh in the box then hit <return>.
This will take you inside th .ssh directory.
- Delete the
known_hosts file.
Now you can use ssh again.
- Double click Macintosh HD
on your Desktop
- Sometime, the MathCS department
changes system information on the workstations
(e.g.: upgrading to a new system).