Error making an ssh tunnel

I'm getting an error trying to create an ssh tunnel.
*ssh –L 10548:localhost:548 [email protected]*
returns
*ssh: Error resolving hostname \342\200\223L: nodename nor servname provided, or not known*
normal ssh works ok so the problem is with localhost. This only happens on one of my computers. the other one connects fine using the same internet connection.
P.S. I just checked and this only happens on one user account. the rest are fine.
Message was edited by: V.K.
this thread is the continuation of [this one|http://discussions.apple.com/thread.jspa?messageID=7218912#7218912].
Message was edited by: V.K.

Very strange. I wonder what \342\200\223L means. You can create a tunnel to the same [email protected] from another account on the same client Mac?
The localhost parameter is actually sent to the server, i.e. it means that sshd should connect port 548 on localhost. What if you put "10548:localhost:548" in quotes? Or try "*ssh –L 10548:my.computer.at.work:548 [email protected]*". You could also try moving or renaming your local ~/.ssh folder to make sure there are no local user settings that are confusing things.

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Remote printing problem using ssh tunnel in Leopard

Haho,
I've recently installed Leopard, and I have unexpected difficulties with setting up remote printing to the printers of my University via ssh tunneling. The following procedure worked (and still works) under Tiger, but for some reason it doesn't work with Leopard (not just for me, but other friends also have the same issue as I do). The question is what could be the source of the problem and how could I get around it?
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Had the same issue with MS Terminal Server printing over vpn tunnel.
what kind of internet connection do you have? one which adds extra headers like pppoe ?
for me ...
sysopt connection tcpmss
helped
default is 1380 (1380 data + 20 TCP + 20 IP + 24 AH + 24 ESP_CIPHER + 12 ESP_AUTH + 20 IP = 1500 bytes)

Using Workgroup Manager via SSH tunnel

Hi all,
I'm attempting to use the Workgroup Manager app to remotely administer a OS X Tiger Server box. The server sits inside my company's LAN behind a firewall, which only allows traffic to the server on ports 21 (ftp), 22 (ssh), 80 (http) and 311 (server admin with SSL, I believe). All services on those ports work fine.
My research on the net indicates that the Workgroup Manager app uses port 625, but since the hardware firewall is blocking traffic on that port to the server, I'd like to create an SSH tunnel to access it. I've tried the following command on my local machine (i.e., not the server):
$ sudo ssh -L 625:localhost:625 [email protected]
and am able to set up the tunnel with no problem. However when I try to connect Workgroup Manager (on the local machine) to localhost, it won't let me connect. So I tried telnetting to localhost port 625 (on the local machine) to see what's up, and received the following error:
$ telnet localhost 625
Trying ::1...
Connected to localhost.
Escape character is '^]'.
Connection closed by foreign host.
Am I missing something? I was under the impression that the SSH tunnel would allow me to access port 625 on the server via port 22. The software firewall is disabled on both machines, so it's not that. I'm not experienced with SSH tunnelling, so I could be totally wrong about the way this is supposed to work.
Thanks in advance!

A quick tcpdump here indicates that Workgroup Manager uses both 311 and 625 when establishing a connection to the server. It may be the lack of port 311 tunneling that's causing your problem.
$ sudo ssh -L 625:localhost:625 -L 311:localhost:311 [email protected]

ORA Connect via SSH Tunnel on Windows failed! LINUX works ...

Hello again,
i tried to establish a Oracle Client Connection via SSH Tunnel on WinXP Pro.
1. Opened SSH-Tunnel Connection with plink (putty)
TUNNEL: 10.5.1.111:1521 => localhost:1521
(plink works fine with telnet, MySQL Client and other stuff)
2. Connected with Oracle Client on Tunnel END => Localhost, Port 1521
3. WIth ORA8i i got: Paket Error, With ORA10g i get: TNS: no listener
plink works fine, so i dont think the problem is located there.
i tried, tnsnames.ora, easyconnect and TNS-Less. So i guess, its not related to the connection method.
i tried the same on LINUX ... ssh tunnel and sqlplus connect ... IT WORKS !
Does Oracle need an aditional Port?
Does it have Problems with WIN2UNIX Connections? (ORA DB is on UNIX)
tnx

Hi,
Hum..., I guess this not work!
Looking for this schema below, you need put the 1521 port
If you desire, access the www.ssh.com site and download other ssh program
           Secure Connection
   +---->-------[SSH]-------->-----+
   |                               |
   |                               |
   ^                               |
   |       Insecure Connection     v
CLIENTE--->--------------------> ORACLE
ssh2 -l oracle -L 1521:192.148.1.251:1521 200.10.11.12
                    |          |                |
                    |          |                |
               A LOCAL        |                |
               B       INTERNAL IP ORACLE       |
               C                       EXTERNAL IP (GATEWAY)
                                                     C                             B
      | Firewall| . . . . .|INTERNET| . . . . . . |Firewall| . . . . . . . . . . |ORACLE|
      | Gateway |                                 |Gateway |                 192.148.1.251:1521
           .                                     200.10.11.12
     A     .
   |Oracle Client|
   (TNSNAMES.ORA)
     <SERVICO> =
       (DESCRIPTION =
         (ADDRESS_LIST =
           (ADDRESS = (PROTOCOL = TCP)(HOST = 127.0.0.1)(PORT = 1521))
         (CONNECT_DATA =
           (SID = <ORCL>)
       )Cheers

Unified Communcation SSH Tunnel failure

HI ,
I have the following problem and maybe anyone could help me .
My Unified Communications traversal zone is still up but I did get this error message
Unified Communications SSH tunnel failure This system cannot communicate with one or more remote hosts Raised Warning Review the Event Log and check that the Zone between the Expressway-C and the Expressway-E is active 2015-03-06 18:35:54 2015-03-06 18:35:54 35013 Unified Communications SSH tunnel notification failure This system cannot communicate with one or more remote hosts Raised Warning Ensure that your firewall allows traffic from the Expressway-C ephemeral ports to 2222 TCP on the Expressway-E 2015-03-06 18:35:55 2015-03-06 18:35:55 35014
didn't find a solution right now .Customer told me firewall port 2222 is open
Thanks for your help
Josef

Hello Josef!
I could picture that the zone might show up even if this part of the tunnel fails.
You could ssh into the box as root and do a tcpdump to see if whats send is received.
the command would look like that:
tcpdump -nl -s0 -i any port 2222
if you run it at the same time on both boxes you should see the same, if you see a lot of
syn packets on the expressway-c you have some proof that there is some communication issue.
Customers believe a lot of things, also that ports are open. Better check and verify it.
If its ok you should see someting like this, this is bi directional packets:
01:18:24.364118 IP 192.168.5.6.40096 > 192.168.2.1.2222: Flags [P.], seq 1292729699:1292729811, ack 3008678290, win 1384, options [nop,nop,TS val 577228689 ecr 576350739], length 112
01:18:24.364156 IP 192.168.2.1.2222 > 192.168.5.6.40096: Flags [.], ack 112, win 1392, options [nop,nop,TS val 576380725 ecr 577228689], length 0
01:18:24.364203 IP 192.168.2.1.2222 > 192.168.5.6.40096: Flags [P.], seq 1:81, ack 112, win 1392, options [nop,nop,TS val 576380725 ecr 577228689], length 80
01:18:24.438240 IP 192.168.5.6.40096 > 192.168.2.1.2222: Flags [.], ack 81, win 1384, options [nop,nop,TS val 577228764 ecr 576380725], length 0
01:18:30.071667 IP 192.168.5.6.41834 > 192.168.2.1.2222: Flags [S], seq 2215504417, win 29200, options [mss 1380,sackOK,TS val 577234397 ecr 0,nop,wscale 7], length 0
01:18:30.071723 IP 192.168.2.1.2222 > 192.168.5.6.41834: Flags [S.], seq 169555520, ack 2215504418, win 28960, options [mss 1460,sackOK,TS val 576386433 ecr 577234397,nop,wscale 7], length 0
01:18:30.105959 IP 192.168.5.6.41834 > 192.168.2.1.2222: Flags [.], ack 1, win 229, options [nop,nop,TS val 577234431 ecr 576386433], length 0
01:18:30.106205 IP 192.168.5.6.41834 > 192.168.2.1.2222: Flags [P.], seq 1:27, ack 1, win 229, options [nop,nop,TS val 577234431 ecr 576386433], length 26
01:18:30.106220 IP 192.168.2.1.2222 > 192.168.5.6.41834: Flags [.], ack 27, win 227, options [nop,nop,TS val 576386467 ecr 577234431], length 0
01:18:30.117569 IP 192.168.2.1.2222 > 192.168.5.6.41834: Flags [P.], seq 1:27, ack 27, win 227, options [nop,nop,TS val 576386478 ecr 577234431], length 26
01:18:30.151886 IP 192.168.5.6.41834 > 192.168.2.1.2222: Flags [.], ack 27, win 229, options [nop,nop,TS val 577234477 ecr 576386478], length 0
01:18:30.151913 IP 192.168.2.1.2222 > 192.168.5.6.41834: Flags [P.], seq 27:323, ack 27, win 227, options [nop,nop,TS val 576386513 ecr 577234477], length
if its not ok, nothing on the expressway-e and something like this on the expressway-c, just sending syn packets but no response:
01:21:31.236284 IP 192.168.5.6.41911 > 192.168.2.1.2222: Flags [S], seq 49033653, win 29200, options [mss 1380,sackOK,TS val 577415562 ecr 0,nop,wscale 7], length 0
01:21:33.242267 IP 192.168.5.6.41911 > 192.168.2.1.2222: Flags [S], seq 49033653, win 29200, options [mss 1380,sackOK,TS val 577417568 ecr 0,nop,wscale 7], length 0
01:21:37.250276 IP 192.168.5.6.41911 > 192.168.2.1.2222: Flags [S], seq 49033653, win 29200, options [mss 1380,sackOK,TS val 577421576 ecr 0,nop,wscale 7], length 0
01:21:41.244422 IP 192.168.5.6.41914 > 192.168.2.1.2222: Flags [S], seq 2401170684, win 29200, options [mss 1380,sackOK,TS val 577425569 ecr 0,nop,wscale 7], length 0
01:21:42.246285 IP 192.168.5.6.41914 > 192.168.2.1.2222: Flags [S], seq 2401170684, win 29200, options [mss 1380,sackOK,TS val 577426572 ecr 0,nop,wscale 7], length 0
01:21:44.250278 IP 192.168.5.6.41914 > 192.168.2.1.2222: Flags [S], seq 2401170684, win 29200, options [mss 1380,sackOK,TS val 577428576 ecr 0,nop,wscale 7], length 0
01:21:48.258294 IP 192.168.5.6.41914 > 192.168.2.1.2222: Flags [S], seq 2401170684, win 29200, options [mss 1380,sackOK,TS val 577432584 ecr 0,nop,wscale 7], length 0
01:21:52.252784 IP 192.168.5.6.41915 > 192.168.2.1.2222: Flags [S], seq 3654669449, win 29200, options [mss 1380,sackOK,TS val 577436578 ecr 0,nop,wscale 7], length 0
01:21:53.254253 IP 192.168.5.6.41915 > 192.168.2.1.2222: Flags [S], seq 3654669449, win 29200, options [mss 1380,sackOK,TS val 577437580 ecr 0,nop,wscale 7

SSH Tunnels on start up

Hi,
I want two SSH tunnels i use on a daily basis to start when i start up my mac. They are in the format ssh -f -L 9999:server:25 server -N
Any ideas?

I think ssh will want you to open a terminal window and won't run without it. you can try making a launch daemon to execute this command at login and see what happens but I don't think it will work. get Lingon to make a launch daemon. if that doesn't work save this line as an executable shell script and add it to your login items. this will open a terminal window when you log in and run the script.
BTW, such questions are best asked in the Unix forum under OS X technologies.
Message was edited by: V.K.

SMB through SSH tunnel

I'm having trouble setting up samba access over an SSH tunnel. If I forward port 139 on my machine to port 139 on the server, like so,
ssh -L 139:localhost:139 user@server
and then connect from the finder with Go -> Connect to Server and enter "smb://localhost/username" it works great. Moreover, if I do "smbclient -L localhost -U username" I get (with names changed to protect the innocent):
Domain=[MYSERVERNAME] OS=[Unix] Server=[Samba 3.0.24]
Sharename Type Comment
IPC$ IPC IPC Service (Myservername)
username Disk Home Directories
Domain=[MYSERVERNAME] OS=[Unix] Server=[Samba 3.0.24]
Server Comment
Workgroup Master
OATESNET MYSERVERNAME
That's great. However, I need to in fact be running a samba server on my local machine as well as accessing a remote one --- therefore, I can't forward from port 139 on my local machine because it conflicts with my local samba server (actually, I can, and it appears to be a crapshoot whether my local server or the remote server through SSH gets the connection. Weird. But that's a different story).
So, I try and forward from a different port, say 52187. So I create my tunnel:
ssh -L 52187:localhost:139 username@server
Now I try and connect through the Finder. I get error:
"The Finder cannot complete the operation because some data in "smb://localhost:52187/username" could not be read or written. (Error code -36)."
Hmm. Let's try and diagnose from the console. I type:
smbclient -L localhost -U username -p 52187
It connects to the remote server, but only partially. I get the following output:
Domain=[MYSERVERNAME] OS=[Unix] Server=[Samba 3.0.24]
Sharename Type Comment
IPC$ IPC IPC Service (Myservername)
username Disk Home Directories
Error connecting to 127.0.0.1 (Invalid argument)
Connection to localhost failed
NetBIOS over TCP disabled -- no workgroup available
Weird. Note that this is with my local Samba server not running. Now, if I try and run smbclient with the local server running, I get a different error:
Domain=[MYSERVERNAME] OS=[Unix] Server=[Samba 3.0.24]
Sharename Type Comment
IPC$ IPC IPC Service (Myservername)
username Disk Home Directories
session setup failed: NTSTATUS_LOGONFAILURE
NetBIOS over TCP disabled -- no workgroup available
Weirder --- so I look in the log files for the local Samba server (/var/log/samba/log.smbd). There are two new messages from the exact time when I tried to contact my remote server:
[2007/06/20 17:35:08, 0] /SourceCache/samba/samba-100.7/samba/source/smbd/server.c:main(789)
smbd version 3.0.10 started.
Copyright Andrew Tridgell and the Samba Team 1992-2004
[2007/06/20 17:35:08, 0] pdbods.c:odssamgetsampwnam(2329)
odssam_getsampwnam: [0]getsam_recordattributes dsRecTypeStandard:Users no account for 'username'!
Note that 'username' is not a user on my local machine. I'm not sure what would happen if it were.
What looks like is happening to me is that the samba client is in fact contacting the server on the port that I give, but then trying to initiate some other communication (authentication?) on the default port, 139. That's why when I'm forwarding from port 139 it all works fine. That's also why I get a different error message and stuff in my local logs when the local server is running --- the samba client is contacting the remote server for part of the transaction and the local server for another part. When the local server isn't running, it just can't contact anyone and gets confused.
The question is, how can I make the samba client consistently use the port I tell it to use? Am I missing something?
-Andrew
PS -- why is it that I can have both a local samba server running on port 139 and an SSH tunnel that forwards from that port at the same time? Does it have to do with what interfaces their bound on? As in, the SSH server is only bound on the loopback interface, while the Samba server is only bound on my ethernet card? That's the only explanation I could think of.

well, I'm not doing a smb mount and have never tried to do an smb mount; only an afp mount. I'm very fortunate that I have Macs at work and home, and all authorized users to my computer are Mac users.
I'm running OS 10.4.9 and have been doing this (afp over ssh) throughout all iterations of 10.4.x and most if not all iterations of 10.2.x up through 10.2.8 on two older computers, a 2001 Quicksilver and a 2002 Quicksilver as the servers, and using them as the clients as well along with two Powerbook G4s as clients. Also, my kids (if you call ages 20-26 "kids") afp mount via ssh tunneling as well, from an iBookG4 and iMac G5s, also running 10.4.9.
I gotta ask a dumb question or two or three or four:
• When you ssh, obviously you have the ssh port (only) forwarded through your router and/or modem at home, right?
• Do you have your Mac's (the one you are trying to use as the server) firewall turned on or off? And if on, what ports/services do you have turned on in Sys Prefs Sharing? (and if off, what services are turned on?) Windows Sharing is on?
• If you turned on personal file sharing in your "server" Mac, do you have another Mac that you could try to ssh into, tunneling port XXXX:localhost:548 then from Finder, ⌘k to localhost:XXXX, just to see if that at least works?
• highly unlikely to make a difference, but when you ⌘k to smb://localhost:XXXX, does it help to leave off the "/username" that you had reported in preious posts as appending onto the servername?
One last-minute comment/suggestion: There is a shareware/donationware program called sharepoints that looks pretty cool; you can check that your mount points on your server are indeed smb shared or not (as a side note, if you are so inclined, you can create additional mount points other than just users' home directories, too). I am totally clueless as to how one, from the unix command line or maybe from the NetInfo manager, might do this, so if you would be treading new ground here yourself in this regard, this program might be of some value to you.

Possible to ssh tunnel Bonjour traffic across different subnets?

Hello:
For quite some time, I have been thinking of buying a couple of iSights to enable audio/visual between two distant computers. But I really don't want to have to leave a dozen ports in my DSL modems opened up in order to use AIM or Jabber servers to iChatAV to my "usual" called parties (I can't help it, I'm paranoid - I have one ssh port open on my DSL modem at home - so most everything I do from afar -- afp (port 548), vnc( port 5900), etc., I tunnel it all over ssh).
So, in a similar vein, what I would like to do is treat a distant computer as if it were on my local 192.168.x.x NAT subnet, in order to do a Bonjour-like iChatAV connection without having to go to through these public servers and without having to leave a dozen ports open in my firewall (or go through the drill of opening/closing ports every time I want to iChat).
Now, if I understand this correctly, on one's local subnet, iChat AV works using Bonjour to communicate with other iChat AV users on the same subnet, which, I think, uses multicast packets. So I'm wondering if it is possible to ssh tunnel multicast traffic to a different computer like so:
ssh -L 5297:localhost:5297 -L 5298:localhost:5298 {called.party.IP.address}
thus being able to set up a secure point-to-point iChatAV connection?
Anybody ever do something like this?

Hin j.v.,
It is possible to iChat Bonjour over a Virtual Private Network , yes.
2:33 PM Thursday; May 4, 2006

Ssh tunnel how to set up in SL?

I have a server running SL with the firewall activated. I want to tunnel in to it from outside my own network, while on the road. I have used SSH Tunnel Manager to do so in the past (like for 4 years) but can not get it to work today.
On my SL Server 10.6.8 I can not find anywhere to open ports, but I understand that if I activate File Sharing and Remote Management it will open port 22. Correct?
On my router I opened port 3283 and 5900. Correct?
Where I get stuck is what to put in to SSH Tunnel Manager. I can not find any clear novice instructions for it anywhere. And I am confused as to what to put where.
Can anybody help? Thanks.

Thanks Bob, it is raining cats and dogs so good time to check.
I got it all up and running.
I am testing from a real slow connection (on purpose as this what I have often being on the road) and the screen update is (too) slow. I tried all your methods and can not see any different in speed (read slowness).
BobHarris wrote:
The reason I do this is because Chicken allows me to use reduced colors (like 8-bit colors), and the Vine Server both honors my reduced color request and it actually plays nice with reduced colors (the Mac OS X Screen Sharing server does not alway play nice with anything less then 32-bit colors, which needs a lot more bandwidth).
Where or how do you implement this? I can not find it anywhere. I am on 10.6.8 btw.
And what is more my connection over Mac's Screen Sharing client, having Vine Server server turned on or not on the remote Mac makes also no difference. I can get in either way and speed is the same.
Here is the setting of my remote Mac just in case I should not turn both, the last two, on:
Than there is an other problem.
I suppose this is not a problem as I am tunnelling in over SSH, but would like to make sure.
I also tried to follow the instructions on the alert screen, but no such settings are to be found on the remote computer. Must be an out of date message text. Or am I blind?
Looking forward to your wisdom.
Message was edited by: ChangeAgent.
Had an external link for the images as they refused to upload. Sometimes, when this happens, you can upload images after you post. That worked so removed links.

Error while transferring file :: Error while issuing ssh command.

Hi All,
I am having a JSP based website application.
I am getting the following exception in my logs.
[ERROR] 05/04/2007 03:43:44 - Error while transferring file :: Error while issuing ssh command.
java.net.ConnectException: Connection timed out
            at java.net.PlainSocketImpl.socketConnect(Native Method)
            at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:305)
            at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:171)
            at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:158)
            at java.net.Socket.connect(Socket.java:464)
            at java.net.Socket.connect(Socket.java:414)
            at java.net.Socket.<init>(Socket.java:310)
            at java.net.Socket.<init>(Socket.java:125)
            at com.sshtools.j2ssh.net.SocketTransportProvider.<init>(Unknown Source)
            at com.sshtools.j2ssh.net.TransportProviderFactory.connectTransportProvider(Unknown Source)
            at com.sshtools.j2ssh.SshClient.connect(Unknown Source)
            at com.sshtools.j2ssh.SshClient.connect(Unknown Source)
            at com.sshtools.j2ssh.SshClient.connect(Unknown Source)
            at com.novartis.util.DataExporter.transportFile(DataExporter.java:127)
            at com.novartis.util.DataExporter.export(DataExporter.java:101)
            at com.novartis.businessmanagers.SandosSignupManagerPojoImpl.export(SandosSignupManagerPojoImpl.java:103)
            at com.novartis.util.DataExportJob.process(DataExportJob.java:48)
            at com.novartis.util.ExclusiveJob.execute(ExclusiveJob.java:35)
            at org.quartz.core.JobRunShell.run(JobRunShell.java:191)
            at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:516)Any help would be appreciated.
Thanks.

This means that the SSH server you're trying to connect to isn't listening. Is the SSH server running? Are you trying to connect to the right machine?

SSH tunneling to connect to remote computer

Hi,
I have to connect to my remote database(RHEL box) from a windows using SSH tunnel
1. I have set up the SSH tunneling(with outgoing tunnel)
2. I have made a entry in the TNSnames.ora file
3. I establish connection to the remote server using SSH client and when i do tnsping
i do get connection. Even when i change the host name to some unkown name i do get a tnsping but iam not able to connect to the database. do iam wrong anywhere
Used TNSNAMES adapter to resolve the alias
Attempting to contact (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST = ISIL-PRJ
-04)(PORT = 1523)) (CONNECT_DATA = (SID = ora1022b)))
OK (800 msec)
Used TNSNAMES adapter to resolve the alias
Attempting to contact (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST = ISIL-PRJ
-04)(PORT = 1523)) (CONNECT_DATA = (SID = blablabla)))
OK (800 msec)
even when i change my sid name i get a tnsping. can anybody explain

Hi,
Looking for this schema below and see if help you:
           Secure Connection
   +---->-------[SSH]-------->-----+
   |                               |
   |                               |
   ^                               |
   |       Insecure Connection     v
CLIENT---->--------------------> ORACLE
ssh2 -l oracle -L 1521:192.148.1.251:1521 200.10.11.12
                    |          |                |
                    |          |                |
               A LOCAL        |                |
               B       INTERNAL IP ORACLE       |
               C                       EXTERNAL IP (GATEWAY)
                                                     C                             B
      | Firewall| . . . . .|INTERNET| . . . . . . |Firewall| . . . . . . . . . . |ORACLE|
      | Gateway |                                 |Gateway |                 192.148.1.251:1521
           .                                     200.10.11.12
     A     .
   |Oracle Client|
   (TNSNAMES.ORA)
     <SERVICE> =
       (DESCRIPTION =
         (ADDRESS_LIST =
           (ADDRESS = (PROTOCOL = TCP)(HOST = 127.0.0.1)(PORT = 1521))
         (CONNECT_DATA =
           (SID = <SID>)
       )Cheers

Jconsole - remote connection thru ssh-tunnel

Hi all,
I need to start jconsole on my windows-box and connect to a remote tomcat-server thru an ssh-tunnel.
I have walked thru various posts and blogs, but finally couldn't get it running.
On the linux-server, I have set the following JAVA_OPTS:
export JAVA_OPTS='-Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote.port=8888 -Dcom.sun.management.jmxremote.ssl=false -Djava.rmi.server.useLocalHostname=true -Dcom.sun.management.jmxremote.authenticate=false -Djava.rmi.server.hostname=myserver'myserver is the server-name that is resolved by the hostname-command. I also tried using localhost instead.
On the client I run the following ssh-command to create the tunnel:
ssh tomcat@myserver -L8888:myserver:8888 -N -vWhen I try to create a remote connection with jconsole using localhost:8888, I see the following output by ssh:
debug1: Connection to port 8888 forwarding to myserver port 8888 requested.
debug1: channel 1: new [direct-tcpip]
debug1: channel 1: free: direct-tcpip: listening port 8888 for myserver port 8888, connect from 127.0.0.1 port 1618, nchannels 2It looks not too bad to me, but unfortunately, jconsole runs into a timeout after about 2 mins.
On the server I see the following using netstat:
tcp        0    168 myserver:ssh    mywindowsbox:3381 VERBUNDEN
tcp        0      0 myserver:ssh    mywindowsbox:1317 VERBUNDEN
tcp        0      0 myserver:44625 myserver:8888   TIME_WAIT
tcp        0      0 *:8888                      *:*                         LISTENIt appears to me that the tomcat-server is listening correctly on port 8888 for all incoming hosts (although localhost should be enough).
Furthermore, it seems that the ssh-tunnel has been establised.
Why the hell, jconsole still can't connect?

Hiya.
JMX connections use two ports. You need the RMI Registry and the RMI Stub. This first one you bound to port 8888, but the other one is probably still bound to a random port. You need to be able to access that one through SSH as well.
Trouble is that the second port uses a random port and most application servers can't statically configure this one. See this article for possible solutions (be sure to read the follow ups as well) : http://blogs.sun.com/jmxetc/entry/connecting_through_firewall_using_jmx
Cheers,
Hugp

SSH Tunnel to other SSH servers?

I'm not sure how this can be done, with or even without an SSH tunnel.
Here's my scenario:
PowerBook@Work --> Firewall --> INTERNET --> Linksys Router/Firewall with port forwarding to Mac mini home server --> Mac mini --> Other Mac clients
Obviously I can SSH into my Mac mini server from my PowerBook at work:
ssh [email protected]
However, what I want to do is, to ssh to the Other Mac client on my home LAN from my Work LAN. So far I accomplish this by SSH'ing into my Mac mini server and then SSH'ing from there to my other Mac clients (which all have static 192.168.X.X addresses).
I have tried the following and it's doesn't seem to work:
ssh -N -p 22 [email protected] -R 2110/example.com/22
With port 2110 forwarded from my Linksys to my Other Mac client. Doesn't work.
I know this is one of those scenarios where I "can't see the forest through the trees". Meaning, there must be an easier way? Any help?

Paul,
sorry for my mistake. I forgot the "yes" in the commandline.
I wouldn't put all the different ssh connections into aliases of my .bashrc. SSH offers the use of a config file. Put everything there. It's easier to maintain and the recommended way for ssh.
Create a plain text file in ~/.ssh/config (for example with vi). And put the following stuff in there.
Host nicknameforyourhost
Hostname hostname.example.com
User yourusername
In Addition you might want to add one of these:
Port 22
Protocol 2
Compression yes
ForwardX11 yes
You can even put portforwardings, reflections etc. in there.
LocalForward 10548 127.0.0.1:548 To tunnel AFP on the server.
LocalForward 10080 127.0.0.1:80 To tunnel to an webserver running on the host that is blocked by the firewall.
To tunnel ServerAdmin, Workgroup Manager and Server Monitor Connections to the host (if it's running Mac OS X Server)
LocaLForward 311 127.0.0.1:311
LocalForward 625 127.0.0.1:625
LocalForward 687 127.0.0.1:687
You then connect your admin apps to localhost. This one has to be done as root, as you're forwarding privileged ports.
To forward an http connection to the webinterface of your router through the tunnel. Provided your LAN Range is 192.168.1.0 and your router is located at 192.168.1.1.
LocalForward 10080 192.168.1.1:80
You then connect your browser to http://localhost:10080/ and it will go through the tunnel, and be reflected from the host you connected to via SSH directly to the router. That way you could access your routers config pages without activating remote administration which is of course a lot more secure.
For your particular problem:
Create one Host entry with the actual machine that you connect to.
Host myserver
Hostname myserver.example.com
User yourusername
Protocol 2
Port 22
Compression yes
LocalForward 10080 192.168.1.1:80 see example with router above
LocalForward 10022 192.168.1.100:22 to create a ssh portreflector for host 192.168.1.100
This config will allow you to connect to your server and access your router like I described above and also create a tunnel for another ssh connection to 192.168.1.100. To access that machine, create a second config in that file just a few lines below.
Host myothermac
Hostname localhost
User yourusername
Protocol 2
Port 10022
To use all that you enter into your terminal:
$ ssh myserver
Password:
and from a second terminal:
$ ssh myothermac
Password:
You're directly taken to the othermac. You can put as many options in ther as you like. See the man page for SSH what else you can put into a config file. I hope by now is clear why not to use aliases in your .bashrc. Do some experimenting, you cannot hurt anything.
You could also do that from a screen session or just background the first SSH session from the terminal but that would make things unnecessarily more complex for the examples given.
Hope that helped.
Regards MacLemon

SSH Tunnel to an Oracle SQL Server

Hi all,
I am attempting to set up an ssh tunnel from my local machine to an Oracle SQL server operating on a remote computer, and use it to run a perl script to extract things from that database.
My question is, do I need to have an SQL client on the local machine for this to work? The remote computer does not have the Oracle DBD installed, while the local machine does (hence running the script on the local computer), but will the DBD hand of requests correctly through the ssh tunnel to the SQL server on the remote machine without a client on the local one?
Thanks!

The data access is all happening on the Oracle machine right? Then no, all your local machine needs is an ssh client - that's it. After that all processing is running on the server.

Error making an ssh tunnel

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